Real Quick Help Needed

[wsommariva]

I had some algae growing on the pool sides - fiberglass pool - I added 12 oz of poly 60 algecide and then one pound of pot mono per sulfate. Water quickly turned deep green.

I think it will dissipate in time, but CAN WE SWIN IN THIS NOW?

[chem geek]

Chlorine kills algae. PolyQuat 60 is a preventative but not great for clearing algae. MPS is an oxidizer but again isn't great at killing algae. Shock with chlorine (chlorinating liquid or bleach) at a level appropriate for your CYA level -- see the Chlorine / CYA Chart and also other articles in the Pool School on Defeating Algae. If you have more than 30 ppm CYA in the water, lower your pH to 7.2 first before adding chlorine to shock levels.

I would not swim if you cannot see the bottom of the pool or if there is no measurable Free Chlorine (FC) level. If there is a lot of algae still left to clear in the pool, then swimming during shocking could be irritating -- it won't be harmful in the short-term (you won't do this every day), but it could smell bad from chloramines. A shock level with an FC that is around 40% of the CYA level has the same active chlorine as a pool with an FC of around 0.6 ppm with no CYA so still less than most commercial/public indoor pools that don't use CYA.

[wsommariva]

Thank you. This AM the pool was clear. Next time I won't add the PMPS. I have the CLfree system and I think I had my copper too low.