Reverse Osmosis (RO)

APRO5500 Flow Diagram

The attached photo shows the flow diagram for the APRO5500 membrane. You can also find that photo at the bottom of this post.

The new shut-off valve has a different design than the original.

The previous design had the in-and-out on the right side, with the plumbing running horizontally. The new design will also feature the in-and-out on the right side, but with the flow rate running vertically.

Low Flow Out of Reverse Osmosis


I just replaced the filter on my APRO5500 system and it continues to have a significant decrease in output. It starts out with a normal flow but quickly decreases to a trickle. If I turn it off for a few minutes, it will have significant flow again but significantly decreases as before. Do I need to contact a plumber or a reverse osmosis service company?


Before calling a plumber or service company, try these steps:

Why is the Hole in the Side of My RO Spout Leaking?

The Question:

Why is the hole in the side of my RO spout leaking?

The Answer:

A water leak from a reverse osmosis system's faucet relief hole is a frequent issue, known as an air gap leak. Often, when water leaks from this area it is an indication that your RO's drain tube is clogged or blocked. When food or other debris plugs the drain line it prevents the water from entering your actual drain. However, this is a pretty easy fix.

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