D E is only sticking to the top 1/3rd my filter grids. I have an American Products Titan CM filter, 48 sq feet, (Pool holds 22,000 gals). Water was cloudy with DE and green. Some grids torn, so replaced them all. Small hairline crack on manifold - replace that too. Added new o-rings as well. I vacuumed the pool, cleaned the new grids, vacuumed again, but still have green water with DE in it. Again - when I check the filter only the top 1/3 of the new grids is coated with DE (and seems thicker than normal). I am lost now, have you any suggestions?