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What is the function of laying sand on the foundation of FRP septic tank?

Jia Wei environmental protection warmly reminds you that 100mm concrete cushion should be made after the elevation of FRP septic tank is verified, and 100mm sand cushion should be made after the concrete hardens. Sand cushion can play a mitigating role, which is an essential process for installing FRP septic tanks. Sand cushion can prevent the wear and tear of FRP septic tank after installation and use.