1. Home Page
    2. /
  2. Sera
https://www.ubuy.com.es/en/deals/black-friday-deal-offers-sale

Delivery

Delivery time may vary depending on store and country. To learn more about Shipping Policy

Price Range

€
-

Shop Sera Products Online in Spain

Sort by
|
Sailor SHIKIORI Marker, 20 Colors Set 25-5400-000, White
US Store
セーラー

Sailor SHIKIORI Marker, 20 Colors Set 25-5400-000, White
4.7

100+ bought

€ 44

Sailor Fountain Pen, Bottled Ink, Shiki-Okinori 16 Nights Dreams, Tokiwamatsu 13-1008-202
US Store
セーラー

Sailor Fountain Pen, Bottled Ink, Shiki-Okinori 16 Nights Dreams, Tokiwamatsu ...
4.8

100+ bought

€ 21

Sailor Fude/Brush Pen, Fude De Mannen, Pearl Pink
US Store
セーラー

Sailor Fude/Brush Pen, Fude De Mannen, Pearl Pink
4.5

100+ bought

€ 21

Sailor, Standard Converter, Gold 14-8606-220
US Store
セーラー

Sailor, Standard Converter, Gold 14-8606-220
4.8

50+ bought

€ 19

Sailor 25-5101-003 Fountain Pen, Water Based Pen, Four Seasons Weave Markers, Autumn, Set of 5 Colors
US Store
セーラー

Sailor 25-5101-003 Fountain Pen, Water Based Pen, Four Seasons Weave Markers, ...
4.9

50+ bought

€ 20

Sera Roasted Delicatessen Roasted Eggplant 23 Oz | Ready to Serve Precooked Eggplant | Smokey Flavor | Perfect for Grilling, Vegetables, Meats, Sandwiches! | Kosher 2 PACK
US Store
Sera

Sera Roasted Delicatessen Roasted Eggplant 23 Oz | Ready to Serve Precooked ...
4.4

50+ bought

€ 26

Sailor, Shikiori Ink, Sound of Rain, Potsupotsu, 20ml Bottle, 13-1008-224
US Store
セーラー

Sailor, Shikiori Ink, Sound of Rain, Potsupotsu, 20ml Bottle, 13-1008-224
4.9

€ 23

Sailor Shikiori Fountain Pen Ink Cartridges, Kusa-asobi Series, Hana-kanmuri Flower Crown Spring, Set of 24, 13-0400-233 Pack of 8 Pcs x 3
US Store
セーラー

Sailor Shikiori Fountain Pen Ink Cartridges, Kusa-asobi Series, Hana-kanmuri Flower ...
3.2

€ 21

SAILOR Profit Casual L Basis Fountain Pen Gold Trim Fine Size, Blue, 11-0822-240, Japanese Pocket Fountain Pen, Premium Writing Pen, Made in Japan
US Store
セーラー

SAILOR Profit Casual L Basis Fountain Pen Gold Trim Fine Size, Blue, 11-0822-240, ...
5

€ 134

Sailor 16-0219-220 Multi-Functional Fountain Pen, 2 Colors + Sharp Metallic Fit, Black
US Store
セーラー

Sailor 16-0219-220 Multi-Functional Fountain Pen, 2 Colors + Sharp Metallic Fit, ...
3.6

€ 49

Sailor 11-1219-120 Pro Fit Standard Fountain Pen, Black, Extra Fine
US Store
セーラー

Sailor 11-1219-120 Pro Fit Standard Fountain Pen, Black, Extra Fine
4.4

€ 299

14% OFF
SAILOR Profit Casual L Gold Trim Fountain Pen, Clear Black Fine Nib F, Japanese Made Writing Pen 11-0820-220
US Store
セーラー

SAILOR Profit Casual L Gold Trim Fountain Pen, Clear Black Fine Nib F, Japanese ...
3.1

€ 89 104

Sailor 16-8378-231 Fountain Pen, Multi-Functional Pen, 2 Colors + Sharp Yumi Maki-Ei, Kumamon, Metal Pink
US Store
セーラー

Sailor 16-8378-231 Fountain Pen, Multi-Functional Pen, 2 Colors + Sharp Yumi ...
5

€ 46

Sailor pen, fountain pen, professional gear, Silver, KOP Demonstrator Medium 10-9619-400
US Store
セーラー

Sailor pen, fountain pen, professional gear, Silver, KOP Demonstrator Medium ...
4.3

€ 1277

Sailor HighAce Neo Beginners Fountain Pen, Steel Nib, Fine, Black Body 11-0116-220
US Store
セーラー

Sailor HighAce Neo Beginners Fountain Pen, Steel Nib, Fine, Black Body 11-0116-220
3.8

€ 24

Sailor Profit 21 Fountain Pen, Black, Bold 11-2021-620
US Store
セーラー

Sailor Profit 21 Fountain Pen, Black, Bold 11-2021-620
4.5

€ 617

Sailor Fountain Pen Profit Realo 18K Gold Nib Medium M Clear Black 11-1853-420
US Store
セーラー

Sailor Fountain Pen Profit Realo 18K Gold Nib Medium M Clear Black 11-1853-420

€ 503

Sailor TUZU ADJUST Fountain Pen, Bold Nib B, Rotating Nib Feature and Natural Fit Grip, Includes 2 Ink Cartridges Black and Converter, Limited Edition Clear Navy, 12-0541-642
US Store
セーラー

Sailor TUZU ADJUST Fountain Pen, Bold Nib B, Rotating Nib Feature and Natural Fit ...
4

€ 52

Sailor Profit Standard 21 Fountain Pen Medium Nib Black 11-1521-420
US Store
セーラー

Sailor Profit Standard 21 Fountain Pen Medium Nib Black 11-1521-420
5

€ 648

Sera Holiday Tabs 10 pcs. | Vacation Fish Feeder | Slow-Dissolving Tabs
US Store
Sera

Sera Holiday Tabs 10 pcs. | Vacation Fish Feeder | Slow-Dissolving Tabs
3.6

€ 22

Sailor Fountain Pen, 11-1227-301, Four Seasons Weave, Fairy, Dragon Miyagi Castle, Medium Fine Point
US Store
セーラー

Sailor Fountain Pen, 11-1227-301, Four Seasons Weave, Fairy, Dragon Miyagi Castle, ...
4.3

€ 283

sera 100 cm Grey Oak Floor Unit with Door for Scaper Cube, Large
US Store
Sera

sera 100 cm Grey Oak Floor Unit with Door for Scaper Cube, Large
3.3

€ 144

Sera X-Feeder Fish Feeder
US Store
Sera

Sera X-Feeder Fish Feeder
3.8

€ 78

Sailor Fountain Pen, Profit Fountain Pen, Rearo, Black, Bold 11-3924-620, Black/Bold
US Store
セーラー

Sailor Fountain Pen, Profit Fountain Pen, Rearo, Black, Bold 11-3924-620, Black/Bold
4.2

€ 677

Sailor Fountain Pen Ink Cartridges, Tsurubami Brown Color
US Store
セーラー

Sailor Fountain Pen Ink Cartridges, Tsurubami Brown Color
3.4

€ 16

Sera Koi Professional Spring & Fall Food 15.43lb | Floating Koi Pellets
US Store
Sera

Sera Koi Professional Spring & Fall Food 15.43lb | Floating Koi Pellets
4.6

€ 187

Sailor Fountain Pen, 13-1530-202 Fountain Pen Bottle Ink, Shimmering Ink, Sukigokoro, Dye, 20ml
US Store
セーラー

Sailor Fountain Pen, 13-1530-202 Fountain Pen Bottle Ink, Shimmering Ink, ...
4.6

€ 23

Sailor Fountain Pen, Dye Bottle Ink, 50ml, Blue Black 13-1007-244
US Store
セーラー

Sailor Fountain Pen, Dye Bottle Ink, 50ml, Blue Black 13-1007-244
4.5

€ 22

Sailor Shikiori Fountain Pen Ink Cartridges, Kusa-asobi Series, Sasabune Bamboo Leaf Boat Summer, Set of 24, 13-0400-234 Pack of 8 Pcs x 3
US Store
セーラー

Sailor Shikiori Fountain Pen Ink Cartridges, Kusa-asobi Series, Sasabune Bamboo ...
4.5

€ 16

Sailor 12-0332-320 Fountain Pen, Recl All Black, Medium Point
US Store
セーラー

Sailor 12-0332-320 Fountain Pen, Recl All Black, Medium Point
5

€ 95

19% OFF
Sailor 1911 Profit Casual Fountain Pen Black & Gold Fine
US Store
セーラー

Sailor 1911 Profit Casual Fountain Pen Black & Gold Fine
4.2

€ 72 89

SAILOR Profit Casual L Basis Fountain Pen Gold Trim Medium Size, Green, 11-0822-460, Japanese Pocket Fountain Pen, Premium Writing Pen, Made in Japan
US Store
セーラー

SAILOR Profit Casual L Basis Fountain Pen Gold Trim Medium Size, Green, ...

€ 123

2 X Sailor Fountain Pen Converter 14-0500
US Store
セーラー

2 X Sailor Fountain Pen Converter 14-0500
4.2

€ 33

Sailor Profit Casual L Stable Gold Trim Fountain Pen Clear Blue, Bold Nib B, Japanese Made Writing Pen 11-0825-640
US Store
セーラー

Sailor Profit Casual L Stable Gold Trim Fountain Pen Clear Blue, Bold Nib B, ...

€ 157

Sera Viformo Pleco Tabs 5.6 oz 250 ml | Bottom Feeder Fish Food
US Store
Sera

Sera Viformo Pleco Tabs 5.6 oz 250 ml | Bottom Feeder Fish Food
4.7

€ 35

4% OFF
Sailor Fountain Pen, 13-1008-234 SHIKIORI Fountain Pen Bottled Ink, Shikiori, Grass Play, Sasafune, Dye, 0.7 fl oz 20 ml
US Store
セーラー

Sailor Fountain Pen, 13-1008-234 SHIKIORI Fountain Pen Bottled Ink, Shikiori, Grass ...
4.4

€ 24 25

Sailor 11-1222-220 Fountain Pen, Professional Gear, Slim, Silver, Black, Fine Point
US Store
セーラー

Sailor 11-1222-220 Fountain Pen, Professional Gear, Slim, Silver, Black, Fine Point
4.4

€ 261

Sailor 11-1219-220 Fountain Pen, Pro Fit Standard, Black, Fine Point
US Store
セーラー

Sailor 11-1219-220 Fountain Pen, Pro Fit Standard, Black, Fine Point
4.1

€ 223

Sailor Pro Fit 21 Fountain Pen, Silver, Black, Medium Point, 11-2024-320
US Store
セーラー

Sailor Pro Fit 21 Fountain Pen, Silver, Black, Medium Point, 11-2024-320
4.7

€ 645

Sailor Fountain Pen, Fountain Pen Nib Dip Pen, Hocoro, Pen Axis, Shiro 14-0135-210
US Store
セーラー

Sailor Fountain Pen, Fountain Pen Nib Dip Pen, Hocoro, Pen Axis, Shiro 14-0135-210
4.4

€ 15

Sailor 11-0558-204 Fountain Pen, Four Seasons Weave, Moon and Night Water, Frost Night, Fine Point
US Store
セーラー

Sailor 11-0558-204 Fountain Pen, Four Seasons Weave, Moon and Night Water, Frost ...
4.5

€ 47

Sailor Fountain Pen, Profit Jr. Lilac, Medium Fine 12-0222-350
US Store
セーラー

Sailor Fountain Pen, Profit Jr. Lilac, Medium Fine 12-0222-350
3

€ 34

Sailor Fountain Pen, Professional Gear, Silver, Demonstrator Model, Medium Point, 11-3775-300
US Store
セーラー

Sailor Fountain Pen, Professional Gear, Silver, Demonstrator Model, Medium Point, ...
5

€ 553

5% OFF
Sailor 12-0333-380 Fountain Pen, Reckle, Pale Brown, Medium Point
US Store
セーラー

Sailor 12-0333-380 Fountain Pen, Reckle, Pale Brown, Medium Point
4.1

€ 42 44

Sailor 16-0719-202 Fountain Pen, Oil-Based Ballpoint Pen, Four Seasons Weave, 0.7 mm, Manleaf
US Store
セーラー

Sailor 16-0719-202 Fountain Pen, Oil-Based Ballpoint Pen, Four Seasons Weave, 0.7 ...
4

€ 63

Sailor Fountain Pen, TUZU ADJUST Fountain Pen, Packaged, Grey, Fine Point, 11-0549-221
US Store
セーラー

Sailor Fountain Pen, TUZU ADJUST Fountain Pen, Packaged, Grey, Fine Point, ...
3.8

€ 40

sailor 12-0137-210 fountain pen nib pen hocoro 2.0mm wide white
US Store
セーラー

sailor 12-0137-210 fountain pen nib pen hocoro 2.0mm wide white
4.2

€ 21

Sailor 13-6210-370 Fountain Pen, Bottle Ink, Ink Workshop, 370, Dye, 0.7 fl oz 20 ml
US Store
セーラー

Sailor 13-6210-370 Fountain Pen, Bottle Ink, Ink Workshop, 370, Dye, 0.7 fl oz 20 ml
4.7

€ 32

5% OFF
Sera San Nature Food 0.8 oz.
US Store
Sera

Sera San Nature Food 0.8 oz.
4.6

€ 21 22

Sailor Fountain Pen Converter 14-0500
US Store
セーラー

Sailor Fountain Pen Converter 14-0500
4.6

€ 15

Sailor Fountain Pen, Hocoro, Medium Point, Gray 12-0135-421
US Store
セーラー

Sailor Fountain Pen, Hocoro, Medium Point, Gray 12-0135-421
4.3

€ 34

Sailor, Box of 12 Ink Cartridges, Dye Ink, Black, 13-0404-120
US Store
セーラー

Sailor, Box of 12 Ink Cartridges, Dye Ink, Black, 13-0404-120
5

€ 22

Sera Filter Wool, 500 grams
US Store
Sera

Sera Filter Wool, 500 grams
4.6

€ 31

Sailor Profit Casual L Stable Gold Trim Fountain Pen Clear Blue, Fine Nib F, Japanese Made Writing Pen 11-0825-240
US Store
セーラー

Sailor Profit Casual L Stable Gold Trim Fountain Pen Clear Blue, Fine Nib F, ...
5

€ 170

Sera Flore Active CO2 Reactor 500 - Small 66-160 Gal
US Store
Sera

Sera Flore Active CO2 Reactor 500 - Small 66-160 Gal
3.8

€ 55

Sailor Fountain Pen, TUZU ADJUST Fountain Pen, Packaged, Black, Bold Point 11-0549-620
US Store
セーラー

Sailor Fountain Pen, TUZU ADJUST Fountain Pen, Packaged, Black, Bold Point ...
3.2

€ 46

Sailor 11-0543-300 Professional Color 500 Fountain Pen, Transparent, Medium Point
US Store
セーラー

Sailor 11-0543-300 Professional Color 500 Fountain Pen, Transparent, Medium Point
4

€ 97

Sailor Pen multi-function ballpoint pen Metarino 4 16-0222-219 Silver
US Store
セーラー

Sailor Pen multi-function ballpoint pen Metarino 4 16-0222-219 Silver
3.5

€ 39

SAILOR Professional Gear Slim Mini Fountain Pen 21K Gold Nib Medium, Ivory, 11-2155-417 Japanese Pocket Fountain Pen, Premium Writing Pen, Made in Japan
US Store
セーラー

SAILOR Professional Gear Slim Mini Fountain Pen 21K Gold Nib Medium, Ivory, ...

€ 397

Sailor Junior Skeleton Demonstrator Nickle Chrome Platedmf Nib Fountain PEN
US Store
セーラー

Sailor Junior Skeleton Demonstrator Nickle Chrome Platedmf Nib Fountain PEN
4.3

€ 30

3% OFF
Sera Nitrate NO3 Test Kit 60 Tests for Marine Reef and Freshwater Aquariums
US Store
sera

Sera Nitrate NO3 Test Kit 60 Tests for Marine Reef and Freshwater Aquariums

€ 32 33

Sailor Fountain Pen Profit Standard Black Music 11-1219-920
US Store
セーラー

Sailor Fountain Pen Profit Standard Black Music 11-1219-920
4.2

€ 224

Sailor TUZU ADJUST Fountain Pen, Bold Nib B, Rotating Nib Feature and Natural Fit Grip, Includes 2 Ink Cartridges Black and Converter, Perfect for Beginners and Seasoned Users, Gray, 12-0541-621
US Store
セーラー

Sailor TUZU ADJUST Fountain Pen, Bold Nib B, Rotating Nib Feature and Natural Fit ...

€ 50

4% OFF
Sailor 11-0500-242 Fountain Pen, Four Seasons Weave, Hisakata, Uchimizu, Fine Point
US Store
セーラー

Sailor 11-0500-242 Fountain Pen, Four Seasons Weave, Hisakata, Uchimizu, Fine Point
4.3

€ 52 54

sera San Nature 1000 ml
US Store
Sera

sera San Nature 1000 ml
4.2

€ 51

Sailor 16-0305-249 Fountain Pen, Oil-Based Ballpoint Pen, Four Seasons Weave, Hisakata Hokuzu
US Store
セーラー

Sailor 16-0305-249 Fountain Pen, Oil-Based Ballpoint Pen, Four Seasons Weave, ...
4.3

€ 33

Sailor TUZU ADJUST Fountain Pen, Fine Nib F, Rotating Nib Feature and Natural Fit Grip, Includes 2 Ink Cartridges Black and Converter, Perfect for Beginners and Seasoned Users, Black, 12-0541-220
US Store
セーラー

Sailor TUZU ADJUST Fountain Pen, Fine Nib F, Rotating Nib Feature and Natural Fit ...
4.1

€ 42

SHIKIORI Sailor Fountain Pen, Oil Based Ballpoint Pen, Four Seasons, Grass Playing, Garland 16-0357-201
US Store
セーラー

SHIKIORI Sailor Fountain Pen, Oil Based Ballpoint Pen, Four Seasons, Grass Playing, ...

€ 70

Brands Similar to Sera

Tetra
API
Fluval
Marina
Aquafina

All You Need to Know About Sera – Top Picks & More

Sera is a globally recognized brand primarily known for its high-quality aquarium products and accessories. Founded in Germany, Sera has established a strong presence in the international market, catering to both freshwater and marine aquarium enthusiasts. Their commitment to innovation is evident in their extensive range of products, including fish food, water conditioners, and filtration systems designed to promote the health and well-being of aquatic life. Sera's dedication to research and development ensures that all their products meet both quality and environmental standards, fostering trust among customers worldwide. The brand has received numerous accolades for their initiatives toward sustainability and animal welfare, further solidifying their reputation. With a proactive approach to customer feedback, Sera continuously evolves its products to suit the changing needs of the aquarium hobbyist. Sera's global distribution network allows them to reach customers in various countries, ensuring that every aquarium owner can access their reliable solutions. Over the years, Sera has become synonymous with quality and performance, making them a trusted choice for both amateur and professional aquarists alike. Their efficient packaging and user-friendly designs reflect the brand's deep understanding of the aquarium hobby, further enhancing the customer experience. Today, Sera stands as not just a brand, but a partner in the aquatic journey of countless enthusiasts around the world.

Why Buy From Ubuy

  • Authenticity Assurance: Our Sera products are sourced from verified global suppliers and come with the original brand packaging and labeling, ensuring their authenticity.
  • Speedy Delivery: Experience fast delivery services, bringing Sera products from global warehouses right to your doorstep in Spain.
  • Exclusive Global Selection: With Ubuy, you gain access to a vast selection of Sera products not easily found in local stores.
  • Competitive Global Pricing: Ubuy brings you Sera products at prices that leverage the benefits of international pricing, ensuring you save more.
  • Responsive Customer Service: Our dedicated support team is always ready to assist you with any queries regarding Sera products, delivery times, or order process.
  • Effortless Shopping Experience: Enjoy a seamless shopping experience with our easy ordering process and secure checkout when purchasing Sera products.

Top Offerings from Sera to Try in Spain

  • Aquarium Food – Sera Portfolio, Tropical Fish Food, Premium Food Flakes
  • Water Conditioners – Sera AquaShake, Anti-Chlorine Liquid, pH Stabilizers
  • Aquarium Equipment – External Filters, Air Pumps, Heaters
  • Care Products – Sera Aquatan, Medications, Water Testing Kits
  • Decoration – Artificial Plants, Driftwood, Aquascaping Tools

High Rated Products of Sera

  • Sera Vipan Fish Food

    Sera Vipan is a premium floating fish food crafted for all types of tropical fish. Its balanced formulation, rich in essential nutrients and vitamins, promotes optimal growth, color enhancement, and overall fish vitality. The food features slowly sinking granules, allowing fish to feed at their natural water levels. This product not only aids in healthy digestion but also minimizes waste, resulting in a cleaner aquarium environment. Perfect for both beginner and seasoned aquarists, Sera Vipan is a trusted choice for maintaining happy and healthy fish.

  • Sera Coral Reef Salt

    Sera Coral Reef Salt is specially formulated for maintaining a marine aquarium's optimal conditions. This salt mix ensures a perfect balance of essential minerals and trace elements, promoting coral growth and vibrant marine life. Easy to dissolve and use, Sera Coral Reef Salt helps achieve ideal salinity in your aquarium, making it an essential for anyone serious about marine aquascaping. Its high-quality ingredients prevent unwanted algae growth while supporting the biological stability of the aquarium. It's a go-to product for marine enthusiasts.

  • Sera Aquatan Water Conditioner

    Sera Aquatan is an extraordinary water conditioner that detoxifies harmful substances found in tap water, making it safe for aquarium inhabitants. This product is a must-have for every aquarist, as it removes chlorine, chloramines, and heavy metals while enriching the water with essential minerals. Sera Aquatan also promotes natural slime coat development, ensuring fish remain protected against pathogens. With its premium formulation, this conditioner assures immediate use of tap water for aquariums, ensuring a healthy environment for your aquatic pets.

  • Sera Nitrate Test Kit

    The Sera Nitrate Test Kit is a user-friendly and reliable solution for monitoring nitrate levels in your aquarium. High levels of nitrate can lead to algae blooms and harm aquatic life, making this kit essential for maintaining water quality. Each kit offers precise and easy-to-interpret results, allowing you to take proactive measures to manage your aquarium's health. This test kit is suitable for both freshwater and marine environments, making it a versatile tool for every aquarist seeking to create a balanced living space.

  • Sera Air Pump

    Sera's Air Pump is designed to provide optimal aeration and circulation in your aquarium. Its quiet operation and energy-efficient design make it an excellent choice for both freshwater and saltwater systems. The pump comes with adjustable output settings, ensuring the right amount of oxygen is delivered to your aquatic habitat. This essential equipment aids in enhancing the health and vitality of your fish and other aquatic life by promoting water movement and aeration. It's perfect for maintaining the overall ecosystem within your aquarium.

Commonly Asked Questions

  • How can I verify that the Sera products I bought are genuine?

    Sera products sold on Ubuy should come with the brand's packaging and labeling. Be sure to purchase only from Ubuy or verified sellers. In case of doubts, you can contact our customer support and clear it before placing an order.

  • How fast can I get Sera products shipped to my location?

    Shipping times for Sera products to your location can vary based on your specific area and the shipping method selected at checkout. Ubuy carefully processes and ships items promptly, providing estimated delivery times during your order confirmation. You can track your order for real-time updates.

  • What Sera products are best for new aquarium setups?

    For new aquarium setups, consider purchasing Sera Aquatan for water conditioning, Sera Vipan fish food for feeding, and Sera test kits to monitor water quality. These essentials ensure a healthy start for your aquarium, enhancing the overall success of your aquatic environment.

  • What material is Sera aquarium food made from?

    Sera aquarium food is made from high-quality raw ingredients, including proteins, fats, vitamins, and minerals, specifically formulated to meet the nutritional needs of various fish species. Each product is designed to support optimal growth and health, ensuring your fish thrive in their aquatic environment.

  • Is it safe to use Sera products in reef tanks?

    Yes, Sera offers a range of products that are reef-safe and designed to enhance both the health and beauty of your reef aquarium. Products like Sera Coral Reef Salt and Aquatan ensure your marine environment remains stable and healthy without harming delicate coral and other inhabitants.

  • Can I use Sera products for freshwater aquariums?

    Absolutely! Sera has a comprehensive line of products specifically designed for freshwater aquariums. From food to water conditioners and care products, you'll find everything you need to create a thriving freshwater environment.

  • How can I import Sera products to my country?

    To import Sera products to your country, simply browse our website, select the products you wish to purchase, and proceed through our international shipping process at checkout. Ubuy ensures a smooth transaction with various shipping methods for your convenience.

  • Is Sera available for international shipping?

    Yes, Sera products are available for international shipping via Ubuy. We facilitate the delivery of quality aquarium products to multiple countries, ensuring customers around the world can access top-tier aquatic solutions.