Not filtering I have a Pentair Tagelus TA 60D filter that worked well for about 5 years. Two years ago, I started getting cloudy water; so I changed the sand at the beginning of the season last year. The swimming season was really lost for me. The water never cleared. Spent $ on pool "experts" and chemicals: algaecide, shock, filtering aids and more shock. Nothing seemed to help. Ran the pump almost constantly all season, but water remained cloudy. I did notice that when I vaccumed the pool, the water coming back into the pool through the return jets was cloudy,often green. Two pool experts said the problem was simply that I wasn't getting any filtration. They would have replaced the unit, but I decided to try to handle it myself. I went out and bought some pool sand this weekend and took the filter apart today. I was expecting to find a damaged lateral or something of that nature. Everything looked good. I did notice that the sand was very dirty and green near the top, but almost pristine as I neared the laterals. I am a little reluctant just to put in more sand and close it up expecting to get a different result this year. Any ideas? Might it be worthwhile to change the 6-way valve assembly? Can filtered and non-filtered water mix in the valve. I did test the valve under low pressure with my garden hose, and water seemed to take the proper pathways; but I am not sure what might happen with pressure (Usually operate around 20 - 25). I have a 30000 gal inground pool and a 1HP pump. Everything else seems to be operating fine. As I said, the pool was great for several years, which included one previous change of filter sand. Only had the really bad problems just last year.