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Aquarium and pond equipment at the best prices!
For those passionate about aquariophily
Having trouble finalizing your order? Contact us 24 hours a day by email at information@zoanthus.fr.
Basin Analysis
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
Balling Products
Seawater supplements
Basic elements
Fresh Water Supplements
CO2 system
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
Water treatment
Bacterial Treatments
Adverse Treatments
Fish Care
Water treatment
Bacterial Treatments
Adverse Treatments
Fish Care
Water treatment
Bacterial Treatments
Fish Care
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
Sand
Substrate for reactor
Sea Salts
Pond Substrate
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
Seawater Equipment
Basin Equipment
5€ discount for your first order with the code: BIENVENUE05 (from 100€ purchase, offers cannot be combined)
Complete set including:


Regular CO2 production thanks to the control gel
![]() | DENNERLE Bio-CO2 takes advantage of the well-known fact that yeasts can produce CO2 from sugar when deprived of oxygen. However, there is a problem: with pure sugar, fermentation begins very quickly, but already decreases sharply after a few days. As a result, the dose of CO2 released into the aquarium is too high at the beginning and insufficient shortly afterwards. On the other hand, DENNERLE Bio-CO2 with control gel continuously produces an almost invariable amount of CO2 for more than thirty days, i.e. more than a month! The production of each CO2 reserve deposit far exceeds 300,000 CO2 bubbles. This means that your aquarium benefits from an optimal supply every day. ![]() |
The CO2 production of DENNERLE Bio-CO2 increases with the warmer water. The thermal container automatically ensures that the CO2 production is adapted to the temperature of the aquarium. This is because aquariums with higher temperatures have an increased need for CO2.
What they think about it
(and they are right...)
Elena G.
Purtroppo ho fatto un errore e non vedo ancora la produzione di CO2 Spero solo che il problema sia per la temperatura e che ci voglia di più. Purtroppo in casa scendo sotto i 20 gradi e non è costante. Il mio errore è stato di mettere prima l'acqua e poi la capsula all'interno della bottiglia. Attenderò ancora un giorno e poi decido il da farsi. Consiglio di effettuare questi lavori senza nessuno vicino che vi distrae per evitare errori.soprattutto se si è alle prime armi. Speriamo che vada tutto per il meglio. (Translated review)