You need to change filters as recommended, change o-rings, and bleach the fittings. Algae will develop on those. Thats pretty much it. I wouldnt run bleach t

You need to change filters as recommended, change o-rings, and bleach the fittings. Algae will develop on those. Thats pretty much it. I wouldnt run bleach through the filters. The filter medium saturates, and any further use will just recontaminate water