08-04-2013, 09:39 PM
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Originally Posted by spreadtoothinly
It has to do with how big the grains of sand are. Some sand is smaller grained, and some are smaller grained. The smaller grains get picked up much more easily than the larger grains. And pool filter sand has larger grains, and therefore, is harder for the fish to kick up, so less likely to get in your filter.
Exactly right. PFS will not get carried away by the current, so even if the fish kick it up, it will immediately sink back to the bottom.