Hello everyone. I have a 16X48 Intex pool with a intex sand filter and pump assemble. The intex pump recently died so I replaced it with a 3/4HP Game pump and upgraded the return outlet to a Hayward. This pump REALLY moves the water and it seems like every time I vacuum I get a lot of stuff out but 3 or 4 hours later it seems to be back? Very frustrating, last night I vacuumed 3 times got up this morning and it's back The suction on the vacuum head is great and I back flushed the filter after I vacuumed. Any idea's?