VEVOR Pool Filter Balls for Sand Filter, 4.6 lbs, Filter Balls Replace Pool Filter Sand, Reusable Polyester Fiber Filter Media Balls with Wash Bag, for Swimming Pool Above Ground Pool Aquarium Tank
You would need about 4.2 lbs of filter balls to replace 150 lbs of sand.
The 4.6 lb pack should be the correct size with a little extra.
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