Seawater treatment
Seawater treatment important additives for your seawater aquarium
For optimal conditions in saltwater aquariums, professional seawater treatment is of the utmost importance, as otherwise the inhabitants of the aquarium cannot survive and thrive. BB Handel specialises in aquariums and has put together a range of seawater treatment products for your aquarium. These practical aids serve to improve the water quality for marine aquariums and treat the water accordingly. Different components must be added to the water in a balanced equilibrium, such as calcium, magnesium, strontium and other additives. Our products contain everything you need for water treatment.
The right sea salt for reef aquariums
The sea salt products that we offer in our aquarium shop are specially designed for reef aquariums, as coral reefs in particular require a special composition. You will find sea salt products in different quantities so that both hobby breeders with several tanks and owners of individual tanks can be supplied accordingly. We can also recommend our Aquatan product, which has proven its worth in the water treatment of freshwater and saltwater aquariums and always ensures crystal-clear water. If you have any questions about our products in the seawater treatment category, you are welcome to contact us at any time by phone or e-mail. We will be happy to support you in your choice and advise you.
Filter products

Average rating of 4.8 out of 5 stars
Sera marin salt – High-quality sea salt for reverse osmosis and tap water Sera marin salt is a premium sea salt for marine aquariums, characterized by its excellent homogeneity and consistent granulation. It dissolves quickly and completely, providing crystal-clear seawater with stable water parameters. Perfect mineral composition for optimal water quality The salt has natural GH and KH values and contains a biologically balanced blend of calcium and magnesium, essential for the growth and health of corals and marine inhabitants. Natural buffering system for stable pH value Thanks to specially coordinated buffering systems, the pH value remains precise and reliably in the optimal range, ensuring stress-free conditions for all marine life. Long-term trace element supply Through a specialized manufacturing process, the trace elements remain permanently dissolved, making them available to marine aquariums over a long period and ensuring stable water chemistry. Purity without unwanted substances Free from nitrate, silicate, and phosphate Does not artificially affect skimmer performance, thus preserving natural biological filtration Technical details Ideal for reverse osmosis and tap water Ensures clear water with stable parameters Contains all essential minerals and trace elements With Sera marin salt, marine aquarists receive a high-quality and reliable sea salt that ensures perfect water conditions and optimally supports the natural ecosystem in the aquarium.
Content: 1.3 kilogram (€9.96 / 1 kilogram)

Average rating of 4.8 out of 5 stars
Sera marin silicate clear – Effective removal of silicate for clear marine aquariums Silicate can promote unwanted diatom growth in marine aquariums and impair water quality. With Sera marin silicate clear, silicate is easily and permanently bound, keeping the aquarium water clear and maintaining biological balance. Highly effective silicate removal This special product: Reliably binds silicate to reduce algae growth Comes with a practical filter media bag for easy application Has a long-lasting effect of up to three months, depending on the silicate load Easy application for optimal results Rinse briefly under running water before use Place in a filter or in a well-circulated area to ensure maximum effectiveness Technical details 500 g sufficient for aquariums with 200–400 liters of water Long-term effect ensures more stable water values and less algae growth Supplementary silicate control With the Sera SiO3 Test, the silicate level can be reliably determined and monitored to optimally maintain the aquarium. With Sera marin silicate clear, marine aquarists receive an effective solution for silicate control that ensures a healthy, clear, and algae-free aquarium.
Content: 0.5 kilogram (€29.90 / 1 kilogram)

Average rating of 4.9 out of 5 stars
Sera O2 plus – Fast-acting oxygen supply for healthy aquariums Sera O2 plus offers an effective solution for oxygen deficiency and helps stabilize the biological balance in the aquarium. Thanks to its long-lasting effect, it prevents the formation of putrefactive gases and sustainably supports the self-cleaning capacity of the aquarium system. Optimal oxygen supply for a stable aquarium This special product ensures: Rapid oxygen delivery to prevent dangerous oxygen deficiency Long-term support of water quality by effectively binding putrefactive gases Improved self-cleaning capacity, helping to maintain biological stability Benefits for freshwater and marine aquariums The targeted oxygen enrichment promotes the health of fish, plants, and microorganisms and prevents stress caused by poor water quality. Technical details Fast-acting oxygen supply in acute situations Long-term effect that sustainably stabilizes the aquarium Suitable for freshwater and marine aquariums With Sera O2 plus, aquarists get a high-quality oxygen supply solution that ensures long-term stable water conditions and secures the well-being of aquarium inhabitants.
Content: 0.26 kilogram (€49.81 / 1 kilogram)

Average rating of 4.8 out of 5 stars
Sera marin reef salt – High-quality sea salt for healthy coral reefs Sera marin reef salt is a natural high-quality sea salt, specially developed for magnificent reef aquariums. Thanks to its pure individual components, harmful substances are reliably excluded, maintaining biological balance and reducing stress during water changes. Optimal mineral supply for corals and invertebrates This sea salt meets even the highest demands of stony corals and other invertebrates and specifically prevents deficiency symptoms. It contains all essential macro and trace elements necessary for skeletal formation, enzyme production, and color pigmentation in marine organisms. Advantages of Sera marin reef salt 100% pure individual components, free from harmful substances Promotes growth and resilience of corals Optimal water values for a stable ecosystem Reduces stress during water changes through consistently high quality Particularly fine grain for fast solubility Thanks to its fine structure, the salt dissolves easily and quickly, making it immediately ready for use and ensuring consistent water values in the aquarium. With Sera marin reef salt, marine aquarists receive a high-quality, reliable sea salt that optimally replicates the natural environment of a coral reef and ensures long-term health.
Content: 1.3 kilogram (€11.50 / 1 kilogram)

Average rating of 4.8 out of 5 stars
Sera aquatan – Effective water treatment for healthy aquarium water Sera aquatan aquarium water treatment instantly transforms tap water into fish-friendly, mineral-rich water by removing harmful substances and adding essential minerals. It ensures optimal living conditions in freshwater and marine aquariums by binding chlorine, chloramines, and heavy metals while supplying valuable trace elements. Pollutant removal for fish-friendly water The product effectively eliminates: Chlorine and chloramines, which are toxic to fish and shrimp Heavy metals such as copper, zinc, and lead Ammonia, which can be deadly even in low concentrations These substances are reliably removed within a maximum of 10 minutes, protecting aquarium inhabitants from poisoning. Minerals for strong and healthy animals Sera aquatan also contains bioavailable minerals that promote the growth and resilience of fish and invertebrates: Calcium – for a strong skeleton and flawless scales Magnesium – supports muscle growth and vitality Manganese – promotes healthy development and fertility Iodine – strengthens the immune system and supports balanced development Application and dosage 5 ml per 20 liters of aquarium water during each water change, initial setup, or in stressful situations Multiple dosing possible if necessary Technical details Fast water treatment within 10 minutes Binds pollutants and supports biological balance Suitable for freshwater and marine aquariums With Sera aquatan aquarium water treatment, aquarists receive a high-quality water care solution that sustainably supports the well-being and health of their fish.
Content: 0.25 Liters (€15.80 / 1 Liters)

Average rating of 4.8 out of 5 stars
Sera marin bio reefclear – Effective water treatment for marine aquariums Sera marin bio reefclear water treatment is a powerful biotechnology product for marine aquariums that uses highly effective cleaning bacteria to specifically break down ammonium and nitrite. This ensures healthy, clear, and biologically active water, optimizing living conditions for fish and corals. High-quality ingredients for effective water purification The product contains mineral volcanic rock, which: Effectively removes pollutants and stabilizes the ecosystem Binds turbidity, ensuring permanently clear water Provides an ideal surface for cleaning bacteria to support biological processes Benefits for the marine aquarium By specifically promoting natural filtration mechanisms, Sera marin bio reefclear improves water quality in the long term and supports the biological balance in the aquarium. Technical details Biological water treatment using cleaning bacteria Effective degradation of ammonium and nitrite High-quality volcanic rock for long-lasting effect With Sera marin bio reefclear water treatment, marine aquarists receive a scientifically based and highly effective solution to sustainably care for their aquarium and create optimal conditions for fish and corals.
Content: 0.1 Liters (€89.50 / 1 Liters)

























































































































































