Originally Posted by
discuspaul
Yes, the grain size & weight of # 20 or # 30 density PFS is coarse enough not to float up into the water column when disturbed (so won't get sucked into the filter & clog it up), nor will it get siphoned out when using an aquarium vacuum tool for cleaning up debris - just hover the vac about an inch over the sand, some of which may get pulled up a bit into the vac tube, but will simply quickly fall back down. None will get siphoned out.
If you can, get your PFS from a pool or spa equipment supply store to be sure you're getting the real thing - some of the big box stores may sell you 'other sands' (like inexpensive play sands) that are said to be pool filter sand, but they may not be the real thing with proper density.
PFS is usually available at pool supply stores for around $15. for a 50 lb. bag (some stores may carry 2 or more colors of PFS - white, & various shades of tan/beige - I've even seen pinkish or greyish PFS - depends where the quartz rock is quarried).