Cooking rocks

[coolhandgoose]

Disclaimer, this thread is not about crack

I'm currently cooking rocks to get rid of massive GHA and aptasia, it's in a Rubbermaid with a power head and the lid on. It's been in cooking for about a week, I just checked the phosphate level two days after doing a complete water change and it's already at 1.35.

How often should I do a water change while cooking? I was thinking once a week.