Hey! So I’m trying to flock our pool and recirculate the water but the whirlpool setting on the filter isn’t working. The filter setting works fine and water is comes out of the return, we’ve backwashed/rinsed multiple times so that’s working fine but for some reason when we put it on whirlpool the water stops coming out of the return. Very confused what’s going on given everything else is working. Any help would be appreciated