Best charcoal filters I've ever bought, they last a long time I have a reverse osmosis system with three pre-stage filters I use this filter in all three stages and About six months later than me when I change the filter, the first two stages are quite dirty from the sand and silt coming from my municipal water supply, but I don't use cotton or any other type of pre-filter. I use a 5 micron carbon block. manufactured by this company in all three stages and my membranes therefore last 3+4 years
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