51
Introduction to Spectra Chemicals continued...
Complete microbial protection requires a 25% solution of propylene glycol, so care must be
taken that the solution remaining in the watermaker during long term storage is at least 25%,
even if freeze protection is not required. For these reasons Spectra recommends that all pick-
ling be carried out with a 60% or greater concentration.
See Winterizing with Propylene Glycol on page 55.
Propylene glycol can be difficult to flush from a membrane, especially after extended storage
periods with a high concentration. Residual propylene glycol causes high salinity water (high
PPM) and residual flavor in the product water. We recommend flushing the system WITH THE
PRESSURE RELIEF VALVE OPEN for 4-6 hours after storage with propylene glycol—the longer
the better. If, after extended flushing, you still experience low product water quality, cleaning
with SC-2 usually removes all traces of propylene glycol and returns the salinity to the level it
was before storage with propylene glycol. See the Cleaning Procedure on page 56.
Cleaners
Cleaning can be detrimental to the membrane and shorten its life. Avoid unnecessary clean-
ing, and avoid cleaning as a diagnostic tool.
SC-2 is an alkaline cleaner used to remove light oil, grime and biological growth. It is most
effective if heated to 120 deg. F (49 deg. C), which is difficult on a boat. In most cases the wa-
ter quality will increase in PPM (salinity) after an SC-2 cleaning. After a few hours it should re-
cover to near the level it produced before the cleaning
.
SC-3 is an acid cleaner used to remove mineral and scale deposits. In most cases this is used
first and if there is no improvement, go on to the SC-2. SC-3 will in most cases lower the prod-
uct PPM and overall pressures. Scaling is a slow process that may take several months or
years. SC-3 is less harmful to the membrane and will almost always improve the performance
of an older membrane.
For cleaning with either SC-2 or SC-3, see the Cleaning Procedure on page 56.
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Страница 86: ...86 HP TB VEB B HP TB VB HP TB VEB A HP TB BV HP CB CB10 HP CYL SST HP CYL R HP CYL EC HP CYL CCA Not used ...
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Страница 89: ...89 Parts PL MTS 3 8X1 2B HP CYL SST HP CYL CCA SO HPP ECCB HP CYL EC HP CYL R HP CYL PT Parts ...
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