I was under the pression the main drains in pool and spa are supposed to suck. I just noticed today after adding power powder plus down the skimmer, that it's coming back in through the main drains. I don't know of it's always been doing this but I just noticed it today as there was a big powdery mushroom cloud over the drain after adding the stuff. Usually it came out in the spa return jets. Just got a new energy efficient pump installed so I didnt know if that was effecting anything as it takes a lot longer to cycle water.
Is this working right?