my tub has been foaming for the last few days. This is not the fluffy foam. It just sits on the water. The water sounds fizzy. I am very puzzled by this. Water is less then 1 month old. Hardness 250, PH bang on 7.2, ALk was low but not bad 70. The clorine is good, but the Combined was high. I did shock it good on Saturday but still white fizzy foam. I have never had this before.
Any ideas ?