draining pool

I am currently draining my gunite pool on waste, using only the main drain, the pump is working fine and there doesnt seem to be any air leaking anywhere, but there is a small amount of water being returned into the pool through the return jets. What could be the problem?
 
Hello and welcome to TFP! :wave: Perhaps if you have a multiport valve, there is some water getting past the waste cycle via the spider gasket?

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