The pool test kit I have is a 6-way test kit (hth). However, it only has enough for 2 CYA tests. I have seen refills for the items to test chlorine and ph, but not for the CYA. Does anyone know where I can just get the agent I need for more CYA tests?
Also, how often should the CYA be tested?
Also, how often should the CYA be tested?