Re: bluish goo in cartridge after using borax
Didn't stump me.
It's not the borax.
Are the endcaps on the filter by any chance blue? I have seen the rubber endcaps turned into 'goo' by very low pH more than once and you descrbe a VERY low pH situation that was present for probably a long time.
Check the endcaps (both of them) and see if they are soft and/or sticky. I bet they are! I also bet there is blue 'goo' all inside the filter chamber.
The only other thing I know of that will cause blue goo to collect in a filter are some clarifiers. Have clarifiers been added to the pool? (although my money is on the endcap being damaged by very low pH.
Retired pool store and commercial pool maintenance guy.
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