Thioguard®

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.