Ive got an Astral Pool Equilibrium system with an PH probe and acid dosing system. Astral Pool sell a blue PH solution (PH of 7.5) in a 200ml bottle and needs to be replaced every 12months, it costs $40. I find this ridiculously expensive considering it only last 12months. Does anybody know if there is a cheaper solution you can use. I tried distilled water but am getting a very high PH reading of 7.9 where I would of thought it would be 7.0.
Any advice appreciated.