I added some salt this morning and some CYA as is recommended (previous levels were about 30 but I had drained a good bit of water to lower the Ca level -- another story). Pool is about 35,000 gallons.

Anyway, I added it slowly to the skimmer (5 lbs over about 3-4 minutes). Then I notice that the returns are shooting some of this stuff out. It looks like at least 50% of it came back out the returns.

Shouldn't the filter get this? I initially thought I might not have added enough DE when I backwashed, but this stuff is much bigger than DE.

Any thoughts?

Thanks,
Mark