illusionzzz

Hi All, Hoping someone can offer some advice. My new house has a salt water/sand filtered swmming pool. I'm quite used to swimming pools so i know the basics. We had a problem with the water (not really) circulating around the pool, the skimmer boxes were not sucking most of the crap out of the water, also the pool vacuum suction was very very weak. We got some advice and got the pump tested. It was not operating correctly so we replaced it with a brand new one. Now the water is really circulating around the pool but the skimmer does not seem to be sucking much. With my previous pools it has always been impossible to pull out the basket and/or sock while the filter was on but this is not the case here. To test it even further I setup the vacuum with a short section of unblocked hose and to be honest it didn't seem to suck much at all. I have played with all knobs and valves but nothing is ringing any bells.... I have since backwashed the sand filter but to no avail. The water is pumping through the pool great but there is just no suction, what could be causing this? Any help or a point in the right direction would be great. Regards