One extra filtration stage separates the ROES-50 from the ROES-PH75. Here's exactly what that stage does, what it costs, and whether it's worth paying for.
The pH+ stage improves taste for daily drinkers. If the water primarily goes to a refrigerator or is used for cooking where taste is less critical, save the premium and get the ROES-50. For daily glass-of-water use, the ROES-PH75's natural taste is noticeably better — and it also comes with a 75 GPD membrane for faster tank refill.
The ROES-PH75 doesn't just add alkalinity — it also upgrades the RO membrane from 50 GPD to 75 GPD. That's 50% faster tank refill. For households that go through more than 1 gallon per day, the faster membrane means the tank is less likely to run low during peak use. This alone may justify the modest price premium, independent of the pH stage.
APEC ROES-50 on Amazon →APEC ROES-PH75 on Amazon →