I just replaced 325 lbs of sand with 175 lbs of zeolite (as labeled) per recommendation from my Leslie's pool store guy. No trouble doing it, laterals are ok, but I am now getting fine black dust in the pool. It seems to happen when I set to filter after backwash/rinse, but may be happening continuously with pump running. It has been about 5 hrs since I installed the zeolite. Any thoughts? Could it possibly be residual debris from the pipes? It had been about 6 years since the sand was changed, and I was getting this same dust discharge, which was due to "channeling" (also per my pool store guy). They suggested adding cellulose fiber to force the temporary breakup of the channels. This worked great for a while (about 2 weeks) but when it returned I figured it was time to replace the filter media...
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