SETHVILL 4.6 lbs Pool Filter Balls for Sand Filter, Eco-Friendly Reusable Pool Fiber Filter Balls Replace Pool Filter Sand, Pool Filter Media Balls for Swimming Pool (Equals 150 lbs Pool Filter Sand)Brand: SETHVILL Color: White Features: New Eco Friendly Pool Filter BallThese fiber filter balls can perfectly replace the traditional pool filter sand, it is lighter, more environmentally friendly, and more effective than traditional sand filters. Moreover, they won't clog your filters, high quality filter balls extend the service life of the filter. 4. 6 lbs filter ball is equivalent to 150 lbs of filter sand, which can meet your needs and