DE filters are *not* ideal for cleaning swamps; as you've discovered, they clog very rapidly under those conditions.
1. Put the filter on bypass ("recirculate") if you have a multiport valve; otherwise, install a filter bypass.
2. Vacuum to "waste", if you have a multiport; otherwise, install a valved waste discharge line, and use it.
3. Chlorinate with at least 3 gallons of bleach EVERY night; if you give the pool a 'break', the algae will just regrow rapidly!
4. Get a local cheap OTO/phenol red drops (yellow/red) test kit; use it to get the pH in range (7.2 - 7.8). Use muriatic acid (down!)(link in signature) or borax (up!) to adjust.
5. Order a K2006 testkit. You don't need it yet, but you will as soon as the pool is cleaned up.
6. Do not let a pool store sell you algaecide, clarifier (never needed with a DE filter!), floc, etc. Do not buy calcium UNLESS it's a concrete pool.
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