Recently I replaced the sand inside my Triton II filter after witnessing dirty water emitting from my return valves after backwashing. I purchased my home 5 months ago after it sat empty in foreclosure for almost a year. My pool guy hypothesized that during the filter's idle state, the sand "calcified" and consequently the water could not filter through the sand. I was essentially filtering dirty water back into my pool. Today, even after having changed the sand, I still notice a little dirt and debris emitting from the return valves. I was told by my pool guy that this is typical with sand filters, but it annoys me to no end because it essentially can cloud my pool. What are your thoughts on this situation and experiecnce with sand filters, in general?
Thanks, as always, for your insight.