Crown
Spray
THIOGUARD® sewer crown, and maintenance hole spray treatments
offer a safe, inexpensive alternative (or supplement) to continuous
chemical addition.
Thiobacillus bacteria, created from hydrogen sulfide accumulation,
resides on inner sewer surfaces above the waterline (or sewer
crown).
The subsequent bacteria oxidizes hydrogen sulfide to form strong
sulfuric acid. This type of acid virtually attacks the concrete
and can quickly cause severe corrosion. Lowered surface pH is
an indication of sewer corrosion.
THIOGUARD® for crown spraying is a safe, inexpensive, modified
magnesia slurry. Sprayed onto surfaces of the concrete collection
system, THIOGUARD® stops corrosion by harmlessly neutralizing
acids and Thiobacillus bacteria.
Corrosion increases rapidly at pH levels below 4. At pH level
2, concrete castings corrode at about ?" per year.
According to Engineering
News Record, from 1975 to the present, the unit cost
of waste water construction has increased by a factor of over
250%.
During this same period, federal funding has nearly evaporated.
As a result, it now costs most major cities about ten times as
much to construct new sewer systems.
In gravity mains, THIOGUARD® is pumped using a jetter truck,
hose heel and a floating nozzle. An experienced, 3-man crew can
do about one-mile of 48" diameter sewer crown, per day.
We recommend testing your system's concrete-crown pH frequently.
If it is below neutral, plan to start a program soon.
If pH is at 4 or below ... Start Today.
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