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For softened municipal water, and an RO system with 2 to 4 4040 membranes plumbed in series, a good rule of thumb is to set the concentrate to 3+ gpm and set the recycle for half that amount.

Certainly not typical.

Assuming you have them plumbed in series, go no lower than 3 gpm on the concentrate, and if you're at membrane spec pressure and temperature, you should be at about 2500x3=7500/1440=5.2 gpm permeate. adjust this equation if the membranes aren't 2500 gpd, and for your pressure and temperature.

Minimum recommended concentrate flow on a 4" diameter membrane or series of 4" membranes is 3 gpm.

The ratio of permeate to concentrate is affected in a big way by the quality of your feedwater. Let's start there. Is your feedwater less than 1 gpg hardness?

So for the housing that is fed directly from the pump... the water enters from the bottom so the brine seal should be at the bottom. The reject from membrane one feeds the top of membrane 2. So for membrane 2 the brine seal should be at the top. I can't really tell from your photos, but...

The black seal at one end of the membrane is called a "brine seal." In your photo above, the feedwater would come from the left, and would try to force the brine seal open, which makes it contact the inside of the membrane housing. The permeate comes out of the central stem - either end. If...

BINGO!

The key to minimizing concentrate flow is proper pretreatment - meaning the RO feedwater should be less than 1 gpg hardness.

No - it means they will meet factory spec output at a lower pressure. Often 100 psi membranes of the size we're talking about here are referred to as "low energy membranes," and 80 psi membranes are referred to as "extra low energy."

Chris - welcome to the world of RO's. I have lots of questions for you to troubleshoot the system and pinpoint any issues. Even if those membranes were changed out a day before you bought the place, if that RO hasn't run in a year no doubt the membranes are fouled (and they may or may not be...

Membrane manufacturers will tell you that if the system isn't run for 1 week, the membrane needs to be pulled and put in preservative. Most people don't do this, but you're pushing your luck with shutdowns greater than a week in most cases.

We can likely provide you replacement parts for the RO system itself. Russ

Well that took some digging! Yes, we can get it for you. It will only work if you have the correct main board. Pls take a pic of the main board so I can read the serial number on the sticker near the top of the board. If you have the wrong main board, you'd have to get a replacement main...

Let me check

Nice! Do you have a standard Clack 2" valve, or a 2" Heavy valve? The 2" Heavy has Modbus communication capabilities, but not built in WiFi.

The check valve should be on the permeate (RO water tube) AFTER it comes out of the membrane, before it tees into any other tubes/pipes.

A couple of things about these Procon pumps: When it comes time to replace the pump, you'll find the model number on a sticker on what is the bottom of this pump (yellow arrow). We can order replacements for you but it greatly simplifies the process if we know what pump you have. Did you know...

look not only at your membrane size (e.g., 4040: 4" in diam and 40" long, nominal), but also at the test pressure, or the manufacturer's spec pressure. If your vendor doesn't tell you the factory spec pressure on the membrane you're looking at, consider a different vendor! If for instance it's...