Specializing in Portable Exchange DI Water Systems   
Process Quality

Process Quality



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General Water
P.O. Box 1059
Media, PA 19063
(P) 610-358-0717
(F) 610-358-4642
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General Water Services' Quality Processes >>

Contact General Water
General Water utilizes strict quality assurance procedures in all of the products and services that are provided, including: General Water's Resin Regeneration Facility   back to top

Our licensed and insured ion exchange resin regeneration facility is located in Aston Pennsylvania. The minimum lot size per mixed bed regeneration is 110 cubic feet. We can accommodate 60 cubic feet of anion resin and 40 cubic feet of cation resin. (Note: General Water Services is not licensed to, nor does it regenerate ion exchange resins that are used on applications with heavy metals.)

All regenerant chemicals are food grade and we receive a certificate of analysis with each shipment. Our supply chain includes reputable companies who have never interrupted our process due to limited or rationed chemical supply.

Safety is the number one priority for General Water Services. Our safety coordinator trains all personnel annually and toolbox meetings are held on a regular basis to supplement this training. Our safety records are available upon request.

Feel free to call us to arrange a visit to our facility.

Quality Assurance - Tanks   back to top

General Water's large stainless steel tanks are all serialized for traceability.General Water Tank Materials of Construction
All of General Water Services' larger (25 cubic feet and 30 cubic feet) DI water tanks are ASME Code 316 stainless steel. Each standard tank is equipped with a stainless steel hub and polypropylene tank laterals. Tanks with all stainless steel internals are available based on the application. Each tank has side mounted 2 inch camlock inlet and outlet connections. Each tank is mounted on a four-way skid for ease of movement.

General Water Services' smaller tank sizes from 0.25 cubic feet up to 3.6 cubic feet. PVDF tanks are supplied where appropriate. General Water Services uses Pentair Structural Fibers tanks exclusively. We incorporate various head styles based on application. The tank internal distributors are PVC, ABS, polypropylene or PVDF, again based on application. For hot water applications vinyl ester or stainless steel tanks are available.

General Water's DI water exchange tanks are all serialized for traceability.

Tank Traceability, Serialized Tanks
Each General Water Services DI water exchange tank has its own serial number regardless of tank size. Serial number tracking is used in combination with resin lot traceability to track each DI tank and, its ion exchange resin lot, back to its applicable regeneration and retained sample. This gives you complete traceability for any and all DI water tanks delivered to your site. This process is carried back even one step further in that all of General Water Services' ion exchange resin lots can also be traced back to the ion exchange resin manufacturer's production documentation.

The tank number is affixed to the tank and added to the ID yellow tag when filled. The quality paperwork shipped with your DI water tanks notes the serial number of each deionized water tank you are receiving. Our drivers keep a log of where each spent DI tank came from. Finally, the serial number is incorporated into the billing process so we can print out a report of where each deionized water tank has been over the course of its lifetime.

Activated carbon tanks are not intermingled with ion exchange resin tanks. Cation and anion DI water tanks are not intermingled.

Depending on its size and the application, each deionized water tank is rinsed clean with tap water or RO water and sanitized after each use and prior to refilling. All DI water tanks are pressurized and tested for leaks prior to shipment. In general the deionized water tanks arrive at the customer's facility within 24 to 48 hours of being filled.

Activated carbon tanks must be filled, wetted and backwashed 24 hours prior to delivery.

Quality Assurance- Ion Exchange Resin Traceability   back to top

Ion exchange resinIon Exchange "Resin Float"
In the service DI business the ion exchange resin used in the deionized water tanks is called "resin float". It's the ion exchange resin purchased for use at the various customer locations. General Water Services "resin float" is segregated by quality, type and age.

General Water Services does not continually "sweeten" or add new ion exchange resin to the float. That is, we don't have one large lot of resin that we bring up to quality through the addition of new ion exchange resin. For clients who own and operate deionizers or demineralizers this sweetening process is practical. General Water Services, however, does not sweeten the resin float because we lose full traceability and quality records.

Each ion exchange resin batch is limited in size and a record of its performance is kept over the life of the resin batch. As its capacity to produce high purity water lessens, the ion exchange resin is put into applications where deionized water purity requirements aren't as stringent.

All mixed bed ion exchange resins purchased and used by General Water Services are uniform particle size (UPS) and the overwhelming majority of this resin is procured from Dow Chemical.

General Water has numerous mixed bed resin lots, separate cation hydrogen form (H) and anion hydroxide form (OH) ion exchange resins for deionization and a cation sodium form (Na) resin float for use in water softening applications. Should there be a requirement for a specialty ion exchange resin or an ion exchange resin from a particular manufacturer, General Water Services can either purchase that resin or regenerate customer purchased product. Minimum purchases may apply.

Ion Exchange Resin Traceability
We identify ion exchange resins by type, batch and lot number. Each deionized water tank will state the type, the batch (if applicable) and lot of ion exchange resin.

Standard Resins
Mixed Bed Ion Exchange Resin

  • Classification - MBU is used in ultra pure water applications. Typically, deionized tanks with MBU are preceded by cation and anion tanks or reverse osmosis (RO) quality water. The water quality cut off is 10 megohm and the purity requirement is 16-17 megohm.
  • Classification - MBI is used in industrial applications where the water quality cut off is 1 megohm.
Cation and Anion Ion Exchange Resin
  • Cation (H+) - Strong Acid Cation (SAC), is used in conjunction with anion (OH-) ion exchange resin tanks.
  • Anion (OH-) - Strong Base Anion (SBA) Type I, is used in conjunction with cation (H+) ion exchange resin tanks.
  • Anion - Weak Base Anion (WAC), may be used in SAC, SBA configuration or alone with SAC.
Cation (Na+) Softening Resin is used to remove hardness and limited amounts of iron (Fe++).

Segregated Batches
Each type of ion exchange resin is divided into segregated batches. We know the approximate number of cubic feet, age and the manufacturer of each segregated batch of mixed bed ion exchange resin. We do not mix ion exchange resin batches. Because we segregate each batch of ion exchange resin we can track capacity as it ages. Once a batch of resin does not meet quality on a consistent basis we will move it to a less stringent classification.

Lot Numbers
We create a lot number every time we regenerate. Prior to regeneration, we make a list of where the spent ion exchange resin came from and how many cubic feet a particular customer used. If we are regenerating a segregated lot there is only one customer name. Upon completion of the regeneration a lot number is assigned, a sample retained and capacity is tested.

Lot numbers are integrated into during the billing process. In the unlikely event we have a problem with a lot, we are able to create a report that lists where we delivered that particular lot of ion exchange resin.

When a batch is created, the manufacturer's certificate of analysis for the cation ion exchange resin, anion ion exchange resin or mixed bed ion exchange resin is recorded in General Water files.

Segregated Resin Lots   back to top

General Water maintains ion exchange resin just for high purity applications. Due to process and/or company requirements, some ultra-pure deionized water users require a separate, segregated lot of ion exchange resin. In order to do so we require a minimum lot size of 120 cubic feet of mixed bed ion exchange resin or 60 cubic feet of anion exchange resin and 40 cubic feet of cation exchange resin.

Option Advantage Disadvantage
Purchase new ion exchange resin for regeneration No multi-year regeneration contract Large capital expenditure
Lease new ion exchange resin No capital expenditure Multi-year regeneration contract
Segregate GW existing resin No capital expenditure Multi-year regeneration contract less the new resin charge
All options include annual resin testing and certificates of analysis with shipment or delivery.

Contact General Water for Industrial, Commercial and Municipal DI Water Service
General Water is a regional service company utilizing strict quality assurance processes for all deionized water system service offerings. Contact us for further assistance.