Demineralizer Regeneration Frequency Determination

Routinely, I am asked how long will one of our cation-anion two bed demineralizers operate before it has to regenerate. To determine this, we need to know the flow rate and the inlet water quality.  The flow is generally known, but the water quality generally is not early in a water treatment project.  The easiest way is to use conductivity as a rough approximation of water quality for budget purposes only.  Before a system is purchased, a complete water analysis is required to verify with one of the ion exchange resin sizing programs to purchase the correctly sized demineralizer.

Here are a series of graphs I sent to the prospect to help get a budget determined.  The graphs include run times for a DT36072, DT54072 and a DT60072 dual bed demineralizers from Res-Kem. 

For Additional Information:
Ten Questions to Properly Size a Water Treatment System Including a Deionizer/Demineralizer
Equipment Bulletin for a Res-Kem DT36072 Cation-Anion Demineralizer
Equipment Bulletin for a Res-Kem DT54072 Cation-Anion Demineralizer
Equipment Bulletin for a Res-Kem DT60072 Cation-Anion Demineralizer
Need Technical Help sizing a unit?

10 Questions to Answer Before You Specify Water Treatment Equipment

Many times per day, we are asked to provide a quote for a specific water treatment technology like RO, demineralization, water softening, filtration, etc.  At Res-Kem,  we like to take a step back and help you determine what equipment will cost effectively handle your water treatment issue.  Since there are so many choices and combinations of water treatment technologies, we will ask:

1. What are the average, minimum, and peak flow rates you need from the water treatment system?
2. Is the flow continuous or how many shifts do you operate during the day?
3. Do you have or plan to have a tank after the water treatment system?
4. What is the source of your water and do you have an untreated water analysis?
5. What is the water used for and do you have a treated water specification?
6. What are the required temperature and pressure of the treated water?
7. What level of automation do you need, i.e. manual, semi-automatic or fully automatic?
8. Are there any special requirements for the system?
9. When do you need the quotation by?
10. When do you need the system to be installed?

With these questions answered, we can offer a properly sized, cost effective solution to your water treatment problem with minimal maintenance.  

Additional Information:
Online water treatment equipment catalog
Printable questionnaire
For technical questions

Budget Price for a Water Treatment System

A request we frequently get via our website is "I need a budget price for a water treatment system to treat a flow of X gpm."

Our Answer:
Res-Kem welcomes the opportunity to help you size the water treatment system but we need more information than just gallons per minute to correctly size and select the type of water treatment equipment you need. Your needs may not be as simple as a water softener, activated carbon filter, multi-media filter, dealkalizer, RO, DI, demineralizer, or Service DI, etc. Your water treatment application might require a combination of these different water treatment units.

Here is a simple water process schematic of what we are talking about:


To help you, we like to have the following information:

What is the flow rate (gpm) you need from the water treatment system?

Is the flow 24/7?

Do you have an untreated water analysis?

Do you have a treated water specification?

Do you want the system to be manual or automated?

If automated do you want a electro-mechanical timer or PLC?

Are there any special requirements for the system? Your application or industry will give us an indication of your needs.

What materials of construction do you want? Depending upon the size of the water treatment equipment, we can provide units in carbon steel, stainless steel, polyethylene-lined FRP, galvanized steel, PVC, CPVC, copper, etc.

Do you want us to provide a turnkey tearout-install-commission price?

When do you need the system to be installed?

When do you need the quotation by?

Please contact us and we can walk you through the selection and sizing of the industrial water softener, activated carbon filter, multi-media filter, dealkalizer, RO, DI, demineralizer, Service DI, etc. or whatever combination of these water treatment systems you need to make the water quality for your process.