100+ psi RODI supply water

DOJOLOACH · Oct 7, 2020

My new house is over 100psi supply pressure going into my RODI filter, which consists of the following: Sediment filter, 5 micron carbon, another 5 micron carbon, ro membrane, ro membrane, di canister, di canister.

Do you guys recommend installing a regulator on the inlet to the system to bring down to 80psi or so? I don't want the DI resins or RO membrane to be damaged, and I sure don't need a Mur-lok fitting coming loose!

KStatefan · Oct 7, 2020

I would be worried about all of my plumbing fixtures with over 100 psi.

DOJOLOACH · Oct 7, 2020

KStatefan said:
I would be worried about all of my plumbing fixtures with over 100 psi.

Exactly,

I'm not sure why this rental house has such high water pressure. Looks like the mur-lok fittings are rated to 150 psi at 70F at least

Opus · Oct 7, 2020

Do you know where the cut off valve is for the water to the house? Sometimes there is a valve there that allows you to adjust the water pressure to the house. I'm really surprised it is that high, I thought cities had codes on water pressure.

DOJOLOACH · Oct 7, 2020

Opus said:
Do you know where the cut off valve is for the water to the house? Sometimes there is a valve there that allows you to adjust the water pressure to the house. I'm really surprised it is that high, I thought cities had codes on water pressure.

Upon further review we do have n 80psi limit by code. I'll look for a regulator near the shut-off valve. My hot water heater is in the garage, you think it would be near it?

K7BMG · Oct 7, 2020

It would be a rare thing for a home being fed by municipal system to have that much pressure unless the homes regulator has failed or never adjusted.

If your on a well then all bets are off.

Saltyreef · Oct 7, 2020

+2 on checking that regulator, if you even have one installed.

But, you mentioned rental....
Id be calling the landlord immidately so he can do his job correctly and stress over it rather than you

anthonygf · Oct 7, 2020

DOJOLOACH said:
Upon further review we do have n 80psi limit by code. I'll look for a regulator near the shut-off valve. My hot water heater is in the garage, you think it would be near it?

That's odd, my city water pressure is barely 40psi here in Las Vegas. After replacing the pressure regulator then found out the incoming pressure to my house. I had to install a pressure booster pump for the whole house, now I get 65-70. You should have a regulator next to the shut off valve in the garage, if not get the landlord to fix it. I blew up one of my handheld shower heads when I went too high (75psi) with booster pump at first.

DOJOLOACH · Oct 7, 2020

anthonygf said:
That's odd, my city water pressure is barely 40psi here in Las Vegas. After replacing the pressure regulator then found out the incoming pressure to my house. I had to install a pressure booster pump for the whole house, now I get 65-70. You should have a regulator next to the shut off valve in the garage, if not get the landlord to fix it. I blew up one of my handheld shower heads when I went too high (75psi) with booster pump at first.

I'm on city water. I wonder if the laundry room bypasses a regulator that feeds the rest of the house. I've only taken a pressure reading on the cold water line in laundry room. I'll update here what I find out

excell007 · Oct 7, 2020

DI resin will not get the same pressure. The membrane and pre filters should be able to handle that. But I think the other appliances(washing machine, refrigirator) in the house might not.

anthonygf · Oct 7, 2020

excell007 said:
DI resin will not get the same pressure. The membrane and pre filters should be able to handle that. But I think the other appliances(washing machine, refrigirator) in the house might not.

Like I said, when I boosted my pressure close to 75psi one of my shower heads exploded in my hands, glad it didn't hit me or my wife. Lowered my pressure to 65.

infinite0180 · Oct 7, 2020

I agree with everybody above. My new house had 90psi and i immediately had a regulator installed by my plumber friend who turned it down to 65psi. My pipes were banging and its bad for appliances...

DOJOLOACH · Oct 7, 2020

infinite0180 said:
I agree with everybody above. My new house had 90psi and i immediately had a regulator installed by my plumber friend who turned it down to 65psi. My pipes were banging and its bad for appliances...

Alright so if I am to turn it down, would I want pressure rating after my RO membrane and before the DI? Or maybe right before the membrane? Then once I have those numbers I can more accurately turn the regulator on the house

excell007 · Oct 7, 2020

Right before the membrane. Before DI will read lower because the membrane is restricting it. Usually the pressure switches connected to the output line activates at around 45psi.

DOJOLOACH · Oct 7, 2020

excell007 said:
Right before the membrane. Before DI will read lower because the membrane is restricting it.

Alright, I'll aim to get a hair over 65psi right there and hopefully that is sufficient

excell007 · Oct 7, 2020

Having said that, I actually installed a booster pump on my RODI becuase my line pressure is only 55. The additonal pressure improved the production rate and reduced the waste water.