Bought because they are made in the USA and I am suspicious of Asian food and health products. Since they last 2x longer than standard imported filters, they're also a better deal since they're not 2x more expensive. Installation is easy, the instructions are clear and if you follow them, the job takes about 30 minutes. If you don't have a reverse osmosis key, order one, it's worth it. I used an oil filter tape to move the housing the required 1/4" inch. Then it unscrews easily. Put some petroleum jelly on the o-ring, then finger tight, done. By the way, APEC has very good customer service, if you are not sure about something and need an answer to a question.
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