I have an above ground pool with a Heywood Power Flo Matrix pump and Sand Filter. The problem is it's not filtering properly as I have a lot of small debris (dead bugs, pollen, small pieces of leaves, etc) that just stays a float on top of the water. I thought maybe I had an air leak or maybe this was caused by tiny leak or drip in hose connections, but I have pretty much tightened all those up. I have one small drip I can't seem to stop on hose that goes from pump to filter. If I have an air leak, I can't seem to find it. It looks like debris floats into the skimmer, but stays on top of the water inside the skimmer and after a while, nothing else floats into it. My skimmer basket should be filled with how much stuff is in my pool, but really isn't (just minor stuff). A lot of the debris sticks to the top wall of the skimmer itself and also the linear wall near the skimmer (at about same height on wall as skimmer). Interesting enough, if I shut the pump off and then put it back on, you can see the debris flow faster into the skimmer, but like I said it only does it for a little period. I've stuck my fingers a little bit down the skimmer hole and I don't feel a lot of suction, just minor, so thinking that could be the problem. The pump, filter and sand are only 3 yrs old. My next step was to try and change out the sand. Could that be the problem? Also, the pressure is around 20 and it does go to 0 when pump is off. I also can feel water being blown in from the return as well. Lastly, at times I've seen cloudy type water blowing in from the return. I've run out of ideas to try, hopefully someone has something. Sorry for the long post, but trying to provide as much info as possible.