I'm testing with the kit I bought through this forum last time (PS133) that we have just refilled with FAS DPD#1 and FAS DPD#2.

How do I "bump the CYA level up to 30-40"? Last time we sought advice, we were using chlorine tablets and our CYA level was sky high. Being too low is a new problem for us.

I didn't know you needed to test hardness with an AG vinyl lined pool. I tested the hardness tonight using a Aqua Chem drops based kit. After adding solution A, the directions say that a violet color indicates the presence of hardness. My water was barely even tinted. After that you are supposed to add drops of solution B until a blue color is reached. Because my water was barely tinted, no amoung of solution B drops turns the water blue.

I hope I've answered your questions. I appreciate your prompt reply AND your advice!