Just re-surfaced the pool, and completely cleaned out my DE filter. Grids are older, but no noticeable tears. When I put it back together and put about 4 lbs of DE (I had been using about 8-10 lbs, but PB said 4 was good), I get a sporadic "spitting" of DE shot out the return into the pool, both in the spa and the pool. Its not costant, and not a ton, but its noticeable ( I just resurfaced in midnight blue so the DE is very obvious on the pool floor).
Do I need new grids, or is there any other explanation? seems consistent with a tear in a grid, but its intermittent, and I'm within the first week of my re-surfacing, so I don't want to jeopardize the pool or chemistry.