Sand (Vacuum to Waste or Filter)

Waste. Just be sure to watch your water level, it will come out fast. From their website: "One of the disadvantages of using polymeric sand is the chemicals that go into making the product. Polymeric sand relies on a chemical reaction to harden it into the joints between your paving stones. Once it hardens, it is permanent." DON'T WANT THAT IN A FILTER. (Edit for emphasis)
 
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