"I ordered the APEC RO-PH90 last year in May 2018. I had it installed by a plumber familiar with the system. He did an excellent job although as I watched him I realized anyone that is a handyman around the house could easily install the system. I had him run it to my refrigerator so that my ice and water would be filtered. I ordered the RO-PH90 because I know when you filter by osmosis it can take a lot of the minerals out of the water along with the toxic contaminants and the PH puts some good minerals back in. I will have to say my water taste excellent. Better than bottled water. Very delicious and has been a precious resource to me. They recommend changing the carbon sediment filters 6 mos to 1 year. I change them at six months. They were dirty. They recommend changing the PH filter after 1 year, I change it every 6 months with the sediment filters. The RO filter is supposed to be changed in 3 years, I will change it in 2. This system was not that expensive, works great and lasts a long time with proper care. If you drink water, LOL, then you won't be sorry. The customer service and support is fantastic."