Gray water in hot tub - tons of tiny bubbles

[Marta_P]

Hi, every time we turn the heat on in our pool, the water in the hot tub is filled with tons of tiny bubbles, making it look gray. Just to be clear - this doesn't happen when I'm in spa mode and the heat is on for the hot tub. Can anyone offer any advice? Is it something I should ignore, I do not believe it happened last year (we're in our 2nd year with the pool) and I want to make sure I'm on top of any potential issues. Thanks in advance! Martap

 

[Melt In The Sun]

Hm, I have no idea. So it happens with the heat on in pool mode; is the spillway on at this time?