I have had my Vortex D-1 for about 3 and half years now and it has been a real trooper for me. I used to use it whenever I would get a green water outbreak or whenever I had company that would be looking at the tank. We call it the "guest filter."
Anyway, lately, it has not been performing as well. The motor and flow seem to be working as well as ever, but I can't get the green water cleared up the way I used to be able to. I have it on a 10 gallon tank that is pea-soup green, but it has not cleared it in over 24 hours.
I have tried: 1) replacing the little polyester bag that the diatom powder sticks to 2) buying new diatom powder thinking that the old stuff had too large a grain and that the algae were going through the spaces in the powder.
I don't know what else to try. Does anybody have any insights? It is supposed to be able to combat green water, correct? Are there other places in the filter that I should check for gaps, etc.
Thanks in advance,