Thank you for your replies.

Could somebody tell me how much CYA to add? I've had it in a sock for days and days. Did the test today and the sample is clear all the way up the tube. I'm new to this, sorry. So I think I should put a startup dose of it in. What do you recommend for 5K gallons?

I only have the yellow chlorine test and keeping it up but have to keep adding chlorine so feel I should put some more CYA.

We had some hard rain since startup. PH is 7.2 now. Haven't retested for ALK or hardness yet.