The reactive program repairs components when they are not functional and is associated with a significant risk to delivered water quality.
Both components and arrangement of components in the Pretreatment Section may vary with application and nature of the feed water supply. The unit consists of a vessel containing graduated levels of support and filter media to remove particles from feed water with a size of about 10 micron and larger. In an attempt to provide a suggested proactive preventative maintenance program for as many water purification, storage and distribution components and accessories as possible, a purified water System utilizing ozone for bacteria control in the storage and distribution system has been selected. During this time period an unacceptable increase in total viable bacteria could occur as a result of an operating excursion in a water purification unit operation. The Storage, Ozonation, and Distribution System provides a method for storing make-up water from the Ion Removal and Polishing Section, a very effective method for obtaining total viable bacteria control, and a method of delivering Purified Water to individual points-of-use.

The proactive preventative maintenance approach is conservative but virtually eliminates the risk to product water quality associated with water purification component, non personnel, related excursions. A future article will discuss a responsive system monitoring program to detect many excursions before point-of-use water quality is affected.
Gases such as oxygen that will not chemically react with water and reactive gases such as carbon dioxide that will react with RO product water to produce ions are not removed.
Valve seals, diaphragms, or entire assembly should be replaced if water leaks (to the atmosphere or by the sealing mechanism in the water flow path) are noted.
The water softening units contain cation ion exchange resin in vessels and a brine storage tank.
In addition to removing raw water disinfecting agent, activated carbon will reduce the concentration of reverse osmosis membrane fouling naturally occurring organic material (NOM).

For systems with chloramines in feed water, the replacement frequency of activated carbon media should be once every six months, maximum. Any bacteria present in product water from the continuous electrodeionization system would accumulate on the downstream final membrane filtration system and replicate.

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