We just got a 18 x 33 oval pool. We got the 22 inch Waterway sand filter system with 1.5 horsepower pump. Kids over 4th of July and a wayward firecracker caused a leak in one of the hoses. So he hardplumbs it with PVC. Now it seems to not have any pressure on it unless he turn cut off valve partially closed? (then it doesnt leak out backwash port) But when he backwashed it for first time, I'm pretty sure he did it wrong and sprayed sand in pool. Ever since, we had had problems. There is still sand in pool and it's cloudy. And the main issue is there is water coming out the backwash line when in filter position. A good bit of it. We've checked the spider gasket, looks good, too new for a lateral too be broke, could my sand level be low now and causing this? We pumped out a pretty good bit cleaning up the mess. Getting irratated. Please help!!