I used these filters to reduce the water hardness in our apartment (which cannot support a traditional water softener which requires salt to be replaced and lots of space. These filters need to be changed frequently as they have a limited lifespan. I have re-ordered two of the Pentek WS--20BB (I always try to have one on hand as I measure the water hardness and sometimes I need to change the filter switch to the manufacturer's recommended gallons it can handle.) I opened the first box upon receipt and installed it in my Big Blue.The filter you find isn't perfect, but it does a decent job in a condo ( better than nothing) and halved the hardness of our water (clothes are cleaner, dishes aren't cloudy, etc.), I'm straight e arrived at the recommended replacement point (after more than 30 days) based on water consumption and the second WS-20BB filter was broken and damaged - see photo. First, my recommendation is to open these filters immediately upon receipt and carefully inspect them for damage. Second, DO NOT ORDER TWO OR MORE AT A TIME. Revain will need to pack these filters with some padding if more than one filter is being shipped (btw there is no padding in the box the filter is shipped in) as the filters are very heavy which is likely due to damage to the top . a second filter that ran through the "brown" sand-like material used in the water softening process.
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