Thought of one more possible issue: you did replace your filter sand, didn't you?
If not, that could definitely be part of the problem -- PHMB leaves a LOT of residue on filter sand or cartridges.
Re: Losing Chlorine
Thought of one more possible issue: you did replace your filter sand, didn't you?
If not, that could definitely be part of the problem -- PHMB leaves a LOT of residue on filter sand or cartridges.
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