Algicide 60%

[CUTURHAIR]

Ok, I am on my way out the door for the week, but before I go, I wanted to add this post. I added my polyquat 60%, the whole quart last night. I lost about 6ppm's of chlorine overnight, which is odd, as lately, it has been .5 to no more than 2ppm's lost overnight. I tested my CYA, which was finally looking to be over 30, but I could tell as I was pouring it into the tester, that it wasn't as cloudy. So, can the polyquat change CYA? I have never heard of that, but I can't understand what would have caused the big loss overnight, and then again around 1:30 today, I had lost a good bit more ppm's. So, I added another 10 ounces of stabilizer, erring on the cautious side.
Any ideas why I am suddenly having more loss of ppm's since the addition of polyquat?

The pool is very clean, and I hardly saw any must algae on the floor of the pool this morning, so I am just totally confused.

Any insight will be greatly appreciated, now that it is in the hands of my roommate, who is clueless with pool stuff!

Thanks!
John (scared to leave town now!)

[poolrx]

John,

Poly 60 should have no effect on CYA. Don't know why the cl levels dropped unless along with the poly 60 the cl is killing off the rest of the algae. My levels fluctuated until the algae was gone. If you had a hot sunny day it will drop your cl quickly. The 10 ozs of stablizer should help prevent that.

Joe

[tundraSQ]

It has been posted in here many times that the Polyquat WILL drop the FC level, so you will need to compensate for that.

[poolrx]

It has been posted in here many times that the Polyquat WILL drop the FC level, so you will need to compensate for that.

Didn't know that

Always went by Ben's notes regarding poly 60 "Generally, higher chlorine is the best way to control or kill algae. But, occasionally, an algaecide can help. There's really only one product that you can use without risking some rather nasty side effects, including pool stains, green hair, problems with combined chlorine, or disappearing chlorine, and so one. "

I haven't had a problem with it dropping fc levels, but I normally only use 3-4 ounces a week. When using the larger amounts a few yrs ago dealing with the algae I just attributed the lost of cl to fighting the algae.

[ytngt]

I never noticed a drop in FC associated with Poly but anything is possible.

I use Poly as a prevenative measure so there is not an algae bloom when I am adding it. That might be why I don't notice any perceivable cahnge in FC after adding Polyquat.