Main drains for above-ground pools

Yes, as soon as it is obstructed.A blocked bottom drain reduces suction, overloads the pump, and degrades circulation.

Very rarely. A replacement is not being considered.that if:

• THE The ground has shifted.(sagging, misalignment that distorts the assembly),
  
• THE The drain body or piping is cracked/broken.(often following the winter frost),
  
• theregrille/lidis damaged (to be replaced immediately for thesecurity).

Crack or break of drain body or of the piping(often after the freeze winter).

Renovation (change of covering/canvas): we take this opportunity toto change the bottom drain.