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The two primary specs you want to match up are diameter and length which you've already done (4" x 40" nominal) and the pressure at which you run the system. For instance, we stock membranes with pressure specs @ 80 psi, 100 psi, 150 psi, and 225 psi...

We've seen issues with higher than expected water bills at customer's locations when water treatment equipment (e.g., backwashing carbon tanks, softeners, spot free RO systems) malfunction and run water to drain 24/7. Routine maintenance on the equipment solves the issue.

If needed, take a look at the label on the solenoid to determine the voltage it runs on. Might be 110vAC, might be 220vAC, or might be something less like 24 vAC. Next, let us know the female thread size - often 3/4" or 1" are the more common sizes of RO's used in carwashes. Let us know at...

No - it should not be doing that. When commercial RO systems are "off" the current to the system is off. Without current, the normally closed solenoid valve at the inlet to the system should be closed. Yours isn't closing. Either take the solenoid valve apart and clean it (sometimes debris...

Typically the pipe that feeds the repressurization pump comes out of a bulkhead fitting installed near the bottom of a holding tank. The only pressure in that pipe is the head pressure from the tank (just a few psi - about 2.3 psi per foot of tank height). It would be unusual to have a...

Yes... RO water works great in a steamer

If it fits the housing, it'll work great

Just noticed another thing in your pics. Someone has used a large set of channel locks to loosen/tighten your blue sediment filter housing. Bad practice. We have wrenches specifically for that purpose that do not damage the housing. remove, clean, and lube (food grade silicone grease) the...

That's a non-adjustable Series 6 pump, and I don't see a downstream valve - so I think what you get out of that pump is what you get. Your 225 psi membranes are not a good fit for your system. You need membranes spec'd at a lower pressure.

But the pump output isn't at the pressure you need. The pump should be fine once you get membranes installed that are a better fit for the system. Don't close off the concentrate in order to get more pressure. Leave the concentrate at no less than 3 gpm. Can you send some pics of your pump?

Nice! I'd turn that recycle up to 3 and recycle down to 1.5. Is there a globe valve right after the pump or some other valve where you can increase the pump pressure? If not, you don't have enough pump to crank out the 225 spec pressure. When you're ready for new membranes we can look at...

Also - your recycle flow gauge needs to be cleaned.

So I should up pressure and try to get close to 225psi/4.8gppm while keeping reject flow at 3gpm? Yes. I can't advise you on the recycle issue unless you can give me the results of a lab analysis of the water. But, if it is city water, and you have appropriate pretreatment - meaning the...

Your membrane is spec'ed at 225 psi (not 100 psi). Should produce 2400 gpd, or 1.6 gpm (per membrane) given factory spec conditions. 3 x 1.6 = 4.8 gpm, Given that your tap water temperature is likely less than 77F, your permeate flow looks decent. Min concentrate flow should be 3 gpm. You...

No sure how sensitive they are to getting muddy water splashed on them - I would imagine they are very susceptible as they are an optical device.

What do you have the concentrate flow set at?

Can't say I've ever installed a high pressure version, but they are available. E.g., https://www.mcmaster.com/cadinlnord%2f3842k63/

I suspect you will spend more buying parts to assemble your own RO than you will buying one assembled. My advice is to buy one.

There's not enough profit in the parts to cover design of a one-off system. You'd be better off buying a system

No. Here's some RO-related jargon for you: FEEDWATER: The water coming to the RO system inlet. Typically this water has been pretreated to remove hardness (by a softener) and has been treated to remove chlorine or chloramine (by a backwashing carbon tank). PERMEATE: aka - "RO water." This...