With the hot weather, I attempted to cool off the pool water using a PVC fountain that screws into the Polaris port. Eh, can't say it really did anything for the water temperature, but kids sure love playing in it. I tried to unscrew it from the port today and I can't even get it to budge. It just screwed in like anything else so I have no idea why it isn't just unscrewing like anything else. Is there a trick to removing them?