These filters have been in use for many years and they are good but performance seems to vary slightly from filter to filter but that may be more due to irregularities in of water quality than a filter. Will never know Upon arrival of the shipment, check that the filters are not damaged. They are ceramic and may break during transit. We order several filters at once and one day several filters broke and this happened a few months after I bought them so the supplier didn't want to replace them. Some sellers ship very well packaged, others use nothing at all.
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