So to make a long story as short as possible....My husband and I just finished hard plumbing out 20X52 intex pool. We also added a hayward wall skimmer as well. Everything has been great until we started to run into new issues. First off we can't stop algae from growing in the pool no matter what chemicals we had or how many times we scrub the pool. Secondly we tried to vac last night and everytime we hook up the vac to the hayward wall skimmer, we lose suction within minutes and the water level in the basket part of the sand pump goes down by about half. If we take the vac off the hayward and do a backwash on the pump it runs great again. The suction is very strong after that until we hook up the hose again to vac. Is there a possibility the sand could need to be replaced even though its only about a year old? Not sure what else to try at this point.