I have an infinity pool. The overflow part of this has a tank, filter basket 1 inlet to tank and 1 return to pool and does not go via filter thingy. There is another filter basket with 2 down from pool, into filter thingy and 1 back up. The downs are 1 from base of pool and one from side of pool where vacuum plugs in. I know the filter which has glass beads is working as I did a backwash and the water to waste was filthy. Did the wash until water clean then a rinse. The pool has some fluffy looking dirt on the bottom so after the backwash I went to hoover up this dirt. Immediately the inlet was sending out cloudy water. I do not know why nor what to do? Have I given enough info?