It seems to me that this type of filter is the same everywhere. I found them to be neither the cheapest nor the most expensive but the quality is acceptable. You just do a good job. I replace mine with well water in my house every four months and they have a huge impact on the water quality. I installed a couple of sediment filters in front of the large desulphurisation filter and they both help capture debris that would otherwise get into my desulphurisation filter. However, I have to replace these filters every four months to ensure maximum water quality and to protect my larger, more expensive sulfur filter.
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