Algeacides yes or no

[stma]

Point very well taken !! and I'd advise others to follow the POPP method as you indicate..
Incredibly, the pool looks 100% better...but is it the Poly, Metal Out, Low FC OR the vitamin sock i used earlier...??
I'm not so much interested in the "culprit" as to what I did to improve things :>)

Thanks for your posts'..

[chem geek]

Generally speaking, it is a good idea to use an algaecide, such as PolyQuat 60, when doing the metal treatment that by necessity has Free Chlorine (FC) levels go to zero during the ascorbic acid treatment. Otherwise, algae can grow. This is why this sticky refers to its use.

In fact, one easy way to get the FC level lower for the Ascorbic Acid treatment is to add a lot of PolyQuat 60 since high doses will use up chlorine.

Richard

[stma]

Is there such thing as Too Much Poly60 ??? The water now is blue but tremendously cloudy...(actually more cloudy than when I started this ritual)...
But as Mr szampino points out, I'll let it run a few days and see what happens....however it is great to see blue again (no matter HOW it happened)....:>

[chem geek]

I doubt that the PolyQuat is the direct cause of cloudiness. It is viscous, but when dissolved it shouldn't be cloudy. However, PolyQuat is also a clarifier so could consolidate particles causing temporary cloudiness that can be removed by filtration. PolyQuat is not a perfect algaecide and cannot usually completely prevent algae on its own without help from chlorine, but it is far better than having nothing in the pool (i.e. no algaecide and no chlorine).