SnowPure Electropure EXL Series, Oem Engineering Manual, Page: 63 / 81


SNOWPURE, LLC, 2005-2018 VERSION 3.5 (XL+EXL)
–FEBRUARY 2018
PAGE 63
Appendix #2: Resin Cleaning Procedure/TOC in the Feed Stream
The organic cleaner may either be an approved non-ionic surfactant solution, such
as Triton X-100
tm
, or an approved caustic-based solution, such as Avista RoClean
tm
L211.
Recommendation : Minimize the organic fouling of the resins in the EDI system by
minimizing TOC (Total Organic Carbon) via the RO and its pretreatment system.
Suggestion : Use 3-way valves in the design of a CIP system to eliminate the need to
manually disconnect the plumbing when servicing the EDI module.
Surfactant Solution:

10 liters deionized water

10 ml of pure Triton X-100
tm
(or 100 ml of 10% solution), available from Sigma
11
,
or chemical equivalent. Makes a 0.1% solution. This should cost approximately
US$16 for 100 ml, or US$26 for 1 liter. Technical specification sheet and MSDS
are available at www.snowpure.com/knowledgebase.
Caustic Cleaning Solution Formula 1
(best, contains approved buffers and sequestering
agents)
:

9.8 liters deionized water

200 ml RoClean
tm
L211 solution (100 ml for mild fouling), available from Avista
Technologies. Technical specification sheet and MSDS are available at
www.snowpure.com/knowledgebase.
The pH will be 10.5-11.0.

The solution should be heated to 35-40°C for aggressive cleaning.
Caustic Cleaning Solution Formula 2:

9.8 liters deionized water

Sodium Hydroxide (pure NaOH) to make a 0.1-0.5% solution. Target pH 12-13.

The solution should be heated to 35-40°C for aggressive cleaning.
Procedure:

Do not “brine” the resins or the EDI product quality will never recover.

Plug the concentrate and electrode inlet and outlet ports. Isolate the Feed and
Product ports from the RO and the product plumbing.

The cleaning of the resins is DOWNWARD FLOW.

Connect the chemical transfer pump to the PRODUCT port.

Connect the FEED port to a waste recovery tank, or for circulation connect it
to the chemical feed tank.
11
Triton X-100
tm
: CAS 9002-93-1, is also known as t-octylphenoxypolyethoxyethanol, or Octoxynol-9.