Drain bottom center is drain for filtered water. The side drain is a waste water drain. This line must have a line restriction to maintain sufficient back pressure to allow water to flow through the diaphragm. The quality of the goods is. Unfortunately, instructions and the right flow limiter for your membrane volume are not included. With the Dow Filmtec TW30-1812-100 we get 3ppm at 150 and 0-1 at 20ppm. The TDS meter is used to set up and operate reverse osmosis filters and achieve the desired end result.
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