A Pool From The Group Of The Strongest Frame Pools (Gray) , Characterized By Greater Stability Compared To Expansion Pools. After Taking It Out Of The Box, We Form The Pool Into A Rectangle And Assemble The Frame From Pipes. Then We Start Pouring Water. While Pouring Water, The Walls Will Expand Sideways. We Can Pour Water Into These Pools Up To 90% Of The Height Of The Pool Wall.