The Dennerle Bio CO2 set utilizes a control gel that feeds the yeast, which in turn produce a virtually constant level of CO2 for up to 30+ days. Over that time the gel will deplete and will need to be replenished. The Bio CO2 Gel Refill Supply Bottle ensures that your aquarium is supplied with another 30+ days.
The unique character of Dennerle`s products stems from the company`s research activities. The research department is the powerhouse that drives the company, pooling the very latest findings from the field of science, the company`s knowledge acquired from its aquatic plants farm and its extensive practical experience in the world of aquaria. Information from ongoing market analyses ensures a customer-oriented approach.
The company`s collaboration with microbiologists, chemists and botanists has spawned numerous solutions which have changed the face of the aquaria and ponds sector. The technical products, some of which have been patented, e.g. for biotope-compatible lighting, products for magnificent plants and clear water, fish foods and supplements, are hugely popular with our aquarium hobbyists.
Dennerle`s research team collaborates with specialists from other fields as part of an interdisciplinary approach and is the driving force behind the company`s innovative prowess. The secret behind the success of Dennerle`s research department is its understanding of the natural cycles in aquatic environments. Research activities focus not on combating symptoms, but on exerting a positive influence on biological processes – the onus is on experiencing nature, rather than interfering with nature`s workings.
Most orders under $39 ship for only $5.99 using a mix of economy shipping methods including UPS Ground, USPS First Class, and/or SurePost. Your order will be delivered in up to 7 business days after it ships out.
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in up to 7 business days. Just spend $39 or more!
Over 90% of shoppers receive their orders within 1-2 business days. Upgrade from free economy shipping to faster shipping for only $5.99—or spend $250 and we'll upgrade you automatically!
Expedited shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
Same-day shipping is available Monday-Friday for most products—place your order by 10:30 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
We ship live plants, live foods, and frozen foods within the contiguous United States. Each of these categories is subject to its own $19.99 flat-rate shipping fee to cover the special packaging and/or expedited shipping costs required to ensure safe delivery. Orders with 12+ live plants ship free!
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
We are unable to accept returns of Digital Aquatics, Neptune Systems, Vertex Aquaristik, Aqua Illumination (AI), EcoTech Marine, GHL, or Seneye products once the manufacturer's packaging seals have been broken.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
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