Glad I found these on Revain's subscription services. Since our well water is so rusty we need them every month and for half the cost of buying from a big store this is a great deal. I wish they would have lasted a little longer as ours clog up so quickly and as they were a hot tub brand before Kallingan took them they seemed to last longer. Overall still good for removing heavy deposits. Please let me know if this review was helpful.
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