Hello summer, hello algae, hello pool forum!

[chem geek]

If the CC were from chlorine combined with organics in dead algae, then a floc could have settled them to the bottom so that CC isn't registered anymore. That seems plausible. Normally this sort of reduction occurs when the algae gets removed by filtration but obviously that wasn't working in this case.

Just so we know and can keep track of these things, what brand (name and manufacturer) of floc was used? I've heard of good results with OMNI Liquid Floc Plus for a flocculant and have personal experience with GLB Clear Blue for a clarifier.

[True Blue]

1) I did do a bucket test.
2) My CC reading had been at 0.5 or less for several weeks. My FC loss nightly, however, remained above 1.
3) Here is the floc that I used: http://www.amazon.com/exec/obidos/AS...T6TY/poolbooks

[chem geek]

OK thanks. That product contains aluminum chloride (along with polymeric clarifiers) which they technically call a non-alum floc because it is technically not "alum" which is aluminum sulfate hydrate, though I would say that is misleading since both form aluminum hydroxides (several species, many of these positively charged) in the water which is the actual "floc" itself. GLB is a good brand that is reasonably priced.