Hi, welcome to TFP! Unfortunately, you will filter out the foam the algaecide created. Do you use algaecide as a preventative or do you currently have algae?
I’ve never seen poly quat 40 or 60 cause foaming if used in a clear pool. Using algaecide to try and clear a green pool is useless. It’s a preventative method not a fix. Chlorine and testing are your tools needed.
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