Quote Originally Posted by slowtan
I drained (50-60%) and re-filled my pool twice and my CYA level is a little above 100.

Alk 150
PH 7.4
chlorine 4.0 perfect .. all #'s are great. I even took my water to my pool store and they said not to worry about the CYA since everything else is great. I manually tested my water and everything always comes out great. I was high on PH and low on chlorine but both of those are fixed. I am keeping it aroudn 4ppm despite's ben's chart but I have 0 algae and my water is crystal clear. I just want to know if my CYA is going to hurt me in the long run. This is my first year converting to the three B's .

Stephen
If your CYA is over 100, the most conservative charts (not Ben's Best Guess) say your minimum is 3ppm--as long as the water temp stays below 85 deg. If it gets warmer your minimum is 5ppm.

Are you risking an algae bloom? In my opinion, yes.

If you prefer to run this way, I would suggest you regularly dose with Polyquat--first an initial dose, then a weekly dose depending on your size pool. It can help prevent algae if chlorine is too low.