PCTL posts about Oil on their website! Quote:

Waste Water Treatment

Our system helps to decontaminate “frac” water for reuse in the fracking process, saving the industry millions of dollars and preserving the world’s water supply. Some of the many benefits of our system/process include: Elimination of highly toxic chemicals currently used for decontamination, reduced negative environmental impact, reduced recovery costs and potentially opening new areas for oil and gas retrieval.

Turning “Sour” Crude Oil to “Sweet”

In other areas in the gas and oil industry that presents a challenge is in treating existing wells for the presence of H2S of hydrogen sulfide. H2S is a large and growing problem in the industry, due to its continued introduction of bacteria in the fracking process. H2S causes increased production costs. Our solutions reduce those costs and reduce the environmental impact.

https://www.para-con.com/markets-we-serve.php#solution