I have already ordered this product twice in four packs and have been using it successfully for two years. I pre-ordered again and this time it failed miserably. It was easy to install as always, but when I turned the water back on water came out of the right and water out of the left. I shut off the water and reinstalled them, swapped places, now water was pouring from the right side. Since it was a set of four filters, I was able to try a different filter canister, which also leaked. To check if the product is faulty I reinstalled the old filter and there was no leak. The fault was in the canister, not the plumbing system. Then, to add insult to injury, I made my first ever return to Revain and UPS lost the package. I think I'll pay for it. Don't make the same mistake I did. Something has changed in the manufacturing process and these once reliable filters are now leaking. Even a small leak can result in hundreds of dollars in property damage. Do not take any risks.
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