AQUACREST AP5527 Reverse Osmosis Pre and Post Water Filter Cartridge, Replacement for Aqua-Pure AP5527, 5598101, AP-RO5500, APRO5500 Reverse Osmosis System (1 Set), Model No.WF59.

I purchased these filters because they are priced about half the 3M price. This isn't the first time I purchased discount filters and have had both good and bad luck with them. This time, I think they are good.The filters arrived in a cardboard box, wrapped in a plastic shipping bag. The filters themselves are wrapped in cellophane and have a plastic cap over the inlet. At first, I was concerned because the filters had no padding inside the cardboard box, but they appeared fine.The filters installed easily, fitting into their sockets as designed. They filled as designed and appear to work. I will have a professional company test the water to determine the water purity compared to the 3M filters I previously had.Overall, I am impressed with the quality of filter, but concerned about the shipping conditions. I still do not know the the long term performance, but will update the review with any new information. No update is a good sign.

I had no trouble installing and you get two so the extra one comes in handy for later. Excellent value.

Installation was easy; dissolved solids RO water 67 ppm; tap water 152 ppm

I noticed that these filters are larger in diameter than the original, but they still fit fine. I also noticed that they suggest a longer life than the old filters, which I am happy about. It is so nice to have good tasting water again!! (San Diego water doesn't taste very good unless it is filtered.)

Works as expected, good alternative to the OEM filters

Like it

The price is right but these substitutes leak. I didn't notice until after my return window had ended that they were leaking.

Delivery was quick. Use for drinking water system