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the experience that has been posted here before (in other posts) was that the filter is liked but folks often still dry the car themselves. and they use a car shampoo that they liked...
for those with water problems it sounds like a good filter- and glad you had a good experience with the product!
As I recall, 5 - 10 washes per filter and a replacement two-pack is something like $8. The hardness of you water will dictate how many washes the filter will last.