I've just refilled my pool with water; Cya acid had gone up to 300. Just didn't know that the tablets of Cl had it in them. The Pool Supply Store 's water tests didn't spot the problem. (Wondered why the water tasted so bad!)
Did get new test strips. So much easier to read than the old dropper method. Can't wait to totally impliment the BBB method.
30,000 gal, vinyl IG, 3/4 hp pump, sand