As I posted before I've identified a main drain leak. Before simply plugging it and going without I wanted to try this product. I was losing about 2" of water daily.
Since this was a suction leak I followed their recommendations and reversed the flow so the water was returning through the main drain. I put the vacuum in the deep end and brushed to keep the product in solution several times.
The pool has been circulating like this now for 2 days. I've not lost any water at all. I'm hoping this is great news and proof the leak has stopped, but plan to switch flow back tonight and leave the main drain open but valve closed to let it cure, as instructed. If it starts losing, I'll plug it permanently.
In the meantime I'm wondering what to do with any of the product still in suspension in the pool. Water never turned hazy from it, and I really never saw any settled when I brushed. I plan to reinstall my DE grids, coat them and return to normal filtering, but am wondering if this is safe. The instructions say with sand to back wash as needed, I can do that with my DE filter but am I risking clogging my grids or will the DE protect them adequately?