I tested a friends pool with my taylor test kit, and he came up with extremely low alkalinity/PH. They were off the scale and I didn't want to waste my chemicals figuring out how much he needed. He said he hasn't added PH or Alkalinity adder in 3 years. He hasn't put anything in his pool but powered stabilized chlorine. BTW, his CYA level is around 200! Though I'm guessing this may be off because of the low Alkalinity/PH.
I told him he needs to add a lot of Baking Soda and Borax to get his levels up, but he said he doesn't want to because his water is clear and clean and he doesn't have any problems. My question is, what kind of problems can extremely low Alkalinity/PH cause? I want to convince him, but he's very skeptical.