In my commercial pool, the media in the sand filters was recently (2 months ago) replaced with Zeosand. Prior to this replacement, sand was blowing through my returns after every backwash and during normal filter mode. TONS of sand at each return. It ws deemed that a broken lateral was the cause for this. The laterals were all replaced in the filters and the Zeosand was added. (The old sand was removed and only Zeosand is in each filter).
The guys doing the job did not thoroughly backash the zeosand upon start up...they let it filter for a few hours and I went and gave each filter a thorough backwash until the waste water ran clear(not a pea soup color).
Ever since, the Zeosand blows back into the pool after every backwsh Its def not regular sand because it almost looks like kitty litter. THe amount blowing back in has not decreased, and when the guys came out to chek it, all of the laterals were ok in the filters.
What is the reason for this stuff to keep blowing back into the pool after every backwash? It does not blow into the pool during normal filter operation.
Thank you for your help,
Pool is 126,500 gallons