Sounds to me like you have a broken or cracked lateral in your sand filter's tank, or something's assembled wrong.

You should NOT be getting sand in your pool.

You'll need to empty the filter of the zeo to check the laterals. If something's cracked or broken you have to replace it.

I don't get the attraction of ZeoBrite. It's very expensive and a properly set up sand filter, with a little DE, can do just as well. I also use skimmer socks. So my $8 worth of DE is now been used for virtually 2 seasons, and I've only used half. One pack of skimmer socks ($5-$8) lasts a season. So the cost of the Zeo is far greater than the cost of the of the DE and skimmer socks. I'm still on the original sand into the fifth season and see no reason it won't last another 10 years or more.

Yesterday, I did a very careful underwater exam of my pool. Neither it nor the water has ever been clearer. I could look all 40' across the length and see NOTHING but crystal, crystal clear water. It's never looked that clear before either, and this was despite all the pollen.

So why would I replace the sand with Zeo? What's it going to get me?

Just my two cents and humble opinion.