Thanks GF and good info about keeping bleach from the
pump. This is the first cleaning as I did not see a need while it was in operation for those 3 months. A bit of slimy coating on the intake and return hoses, but it really had no color and cam right off. No evidence of algae at all.
I have used your techniques of h2o2 during the grow, and I believe it is a productive technique. Just a capful every 7-10 days and that is it.
Thanks!