new here...but i have been using the tfp method since july of last year...this year i added an swg to my 12500 gallon above ground pool which i havent used yet...after opening, i slammed the pool...and then added salt and raised the cya to swg levels...i noticed the brown patches the bottom and did another slam which was difficult due to the high cya of 70...testing was difficult with a fc level of 33... but i did successfully pass the slam test...so i let the fc drift down to 22 and tested...
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