RTR wrote:My external canisters are all bio-only internally in the canisters, generally housing nothing other than Dupla Minikaskade spheres as the biofilter substrate. The canisters are prefiltered at the tank intake , normally with FilterMax sponges as mechanical filters. At water change time, the canister is shut down, the prefilter pulled and rinsed (tap water is fine, no biofiltration needed or desired on the prefilters), Once monthly the canister is back-siphoned to drain in case any debris has built up internally. They are only opened every six months to a year to clean the hoses internally as and if needed. It is all fast and easy. I have too many tanks to do time-consuming upkeep. A big pat of having more than a handful of tanks is having or developing techniques which are quick and simple while still accomplishing the required processes. In-tank mechanical filtration needs only quic and fast rinsing.
We had an article on bio-only canister filtration in the library, but I do not know if it in the files saved or not. It will be replaced when the site is restored if it is not currently available.
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