Shock with Bleach

[KurtV]

Remember that your free chlorine should be between 5 and 10 ppm with a CYA level of 70.

Your alkalinty is pretty high. Does your pH drift up steadily? If so, you might want to lower your alkalinity (the procedure for doing that is here). You might want to start a new thread in that forum to seek advice on a target level.

Other numbers look good. It's obvious from your questions and responses that you've been doing your homework.

[Watermom]

Is this a vinyl pool?

[Pool in Carolina Blue]

KurtV:

My pH does drift up so I have been using small amounts of pH minus to bring it down once a week or so. I have been keeping the chlorine level at 5 or higher (the Taylor kit only reads to 5) and the 3 reading yesterday is the first time I have seen it dip below 5 since I took over. Thanks for the link on the alkalinity as that might be a solution.

[Pool in Carolina Blue]

Watermom:

This is a gunite pool. I added bleach last night and brought the chlorine level back up the 5 when I tested this morning.