Sight glasses are often required on waste lines and the outflow plumbing of the filter. Flow meters might be required on the heater and filter plumbing as well. Make sure these are always clean, free of leaks, readable, and reflecting accurate pressures and flows. Gas Chlorinator Even distribution of sanitizer is a problem in the large volumes of water found in commercial pools. Because bathers are likely to use the pool or spa immediately after servicing, it is important to make sure chemicals are not lingering in harmful concentrations at any point in the water.
Chlorine gas is the most efficient and least expensive sanitizer.
Injecting it into the circulating water is an effective way of gradually adding chemical to a pool or spa. For commercial pools it is the preferred method of sanitization. When the gas is injected, it mixes with the water to form a solution that is then pumped into the circulation system for delivery to the pool or spa. By regulating the time of operation and volume of gas delivered, the sanitizing of the water can be managed. The incoming water supply might be fill water for the pool or part of the circulation water diverted for this purpose.