i use a small pail in the sink and place a small amount of sand in it. fill with water then start grabbing handfulls and grinding it against itself and thoroughly swishing it around. fill again and repeat until the water runs clear. then i scoop from that pail with my fine fish net and run each scoop under the tap to remove fines and dump into my clean container.
i used this method to do my 50 lbs in my tank and i literally dumped my sand in and the tank remained completely clear. the grinding is great for exfoliating too lol.
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