How many stages do I need for an RODI system?

[becky46]

I have municipal water. Attached are the water test results. I'm not sure how many stages are ideal for an RODI system. I've been purchasing RODI from my LFS up until now.

 

[Freenow54]

Take a look at Watts NO WASTE WATER RO system. I am vary happy with mine. I had to buy the DI filter separate on amazon. The same vender sells replacement filters for the Watts, and also resin for the DI. It is the no waste water design I like the most it is more expensive but saves in the long run. There are now copy cat ones out there.

 

[thatmanMIKEson]

Just added silicate buster, but I have dirty city water thats basically bleach...

 

[Freenow54]

Why a " silicate buster ". I have never heard of that. Also I see the pump. Is yours zero waste? Yes here is what my city water does to m

y first stage filter

 

[thatmanMIKEson]

Why a " silicate buster ". I have never heard of that. Also I see the pump. Is yours zero waste? Yes here is what my city water does to m

y first stage filter

Mine never gets that bad lol

 

[WVNed]

4

 

[Dburr1014]

I'm happy I have a well. I have a whole house filter, 5' tall gac filter for radon, and my incoming ppm is 45ish to the RO filter. No other prefilter.

 

[WVNed]

4

 

[monkeyCmonkeyDo]

4-6 stage systems are common. Get a hold of air water and ice out of flordia for all your water needs. They'll set you up.
D

 

[Woodyman]

I have municipal water. Attached are the water test results. I'm not sure how many stages are ideal for an RODI system. I've been purchasing RODI from my LFS up until now.

What are you looking to spend, and have you asked the city if they use chloramine to treat. Most of the time it isn't listed as being used even when it is.

If chloramine is used you will want at least a 5 stage, without chloramines you can get by with a 4.

Some further reading if your interested:

RO/DI Basic Guide

There are always a lot of questions regarding which RO/DI setup do I need, how many stages, how do I know when to change filters/membranes, I’m getting a weird TDS value, etc. Hopefully this clarifies a few things and helps some of you out one day. My first recommendation would be to find the...

www.reef2reef.com

 

[LeftyReefer]

it looks like your city has chloramines at 2ppm.
I'd go 5 stage, setup to filter out chloramines.

 

[thatmanMIKEson]

I'm happy I have a well. I have a whole house filter, 5' tall gac filter for radon, and my incoming ppm is 45ish to the RO filter. No other prefilter.

My incoming tds is 2-300tds your lucky with the well, are you in the city or out where it gets nice

 

[WVNed]

4
Use a carbon block rated for chloramines if they use that to prevent bacteria in your water.
I would also like to point out additional stages are just using a 2nd of a stage you have in a 4 stage. Like 2 sediment filters, 2 carbon blocks or multiple DI stages.
Some people split the DI stage into 2 or 3 stages and use a single anion/cation type of resin bead in each and a mixed one last. This is usually done on well water.

Stages can be added easily if you start with a 4 stage and want more.

I started with a 4 stage from BRS and added a second DI cannister just so I didn't have to change it so often.

 

[bnord]

enough to keep your solids at 0

 

[Freenow54]

I'm happy I have a well. I have a whole house filter, 5' tall gac filter for radon, and my incoming ppm is 45ish to the RO filter. No other prefilter.

You are lucky. I had to deal with peoples wells quit a bit. They get runoff from whatever the farmers use, E.coli, and Sulphur. Even a good well can go bad literally overnight. Someone builds a home drills a well hits Sulphur. Then everyone gets it.

 

[G Santana]

Take a look at Watts NO WASTE WATER RO system. I am vary happy with mine. I had to buy the DI filter separate on amazon. The same vender sells replacement filters for the Watts, and also resin for the DI. It is the no waste water design I like the most it is more expensive but saves in the long run. There are now copy cat ones out there.

Does the diverted water go into some sort of reservoir before the hot water heater?
This is something I'd be interested in

 

[Freenow54]

Does the diverted water go into some sort of reservoir before the hot water heater?
This is something I'd be interested in

No it does have to be installed " piping" a certain distance from the heater though. It uses a pressure pump to force water through and back into the water heater. Both tubes are connected to the heater. I did not read the distance from the tubing connection requirements until I was done My fault still works. Get the brass fittings work great

 

[Woodyman]

No it does have to be installed " piping" a certain distance from the heater though. It uses a pressure pump to force water through and back into the water heater. Both tubes are connected to the heater. I did not read the distance from the tubing connection requirements until I was done My fault still works. Get the brass fittings work great

I like the highly inaccurate statement that other systems waste 12 gallons for 1 gallon of RO.... even the least inefficient systems produced today are around 4:1

 

[Freenow54]

I like the highly inaccurate statement that other systems waste 12 gallons for 1 gallon of RO.... even the least inefficient systems produced today are around 4:1

Yes saw that , and your correct still beats wasting 4 gallons back down the drain

 

[Woodyman]

Yes saw that , and your correct still beats wasting 4 gallons back down the drain

It does the less waste the better. This is why many people collect and use the waste for other things.