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If you aren't using Di-chlor, Windsurf can drop ship you some.
A lot of clarifiers like Leisure Time Bright and Clear will cause foam too. We're using Sea Klear 4 in 1 Clarifier and it works great with no foam.
No, there was a thread somewhere else that I was refering to. Someone said that they took their filters into the shower to clean them with their shower wand.