Key WaterFed® Terms

Amy LavinIndustry, WaterFed®, Window Cleaning

TDS– Total Dissolved Solids

Measured in parts per million, it measures the impurity level of your water. The average is 100 ppm but varies widely.

Di– Deionization

Ro– Reverse Osmosis

CS– Carbon Sediment

Have you ever noticed WaterFed® exists in a state of abbreviations? TDS. RO. DI. CS. Let’s break them down.

TDS– Total Dissolved Solids is the degree of impurity that exists in the liquid. In our case, it’s the tap water that comes from the client’s house. Levels of impurities range dramatically from one location to the next. They are measured in PPM, or Parts Per Million. Higher PPM equates to higher levels of impurities. We base all our WaterFed® system’s stats on an average 100ppm reading, which gives us a base from which to make estimations (such as how many gallons of water your system can filter before a filter change is needed, or how long individual filters will work), and gives you a way to compare them apple to apples. Our pure water systems, however, are made to work in all TDS levels. It is best practice to test your water’s TDS level twice before starting a job.

Pro Tip: Rinse the top of your TDS meter with purified water before you measure and again in between your first and second TDS measurement.

RO– Reverse Osmosis is one of the filters found on a multi-stage system. The reverse osmosis filter is a semi-permeable membrane that captures anything larger than a water molecule. About 95% of impurities, including naturally occurring minerals, are taken out of the water with the RO filter. These impurities are flushed through a bypass line. This filter is extremely efficient, which is why multi-stage WFP systems are so much less expensive to operate.

DI– Deionization. The DI filter can function as a stand-alone system or work in tandem with the RO and CS filter in a multi-stage system. The filter is composed of small beads (ion exchange beads), which are partially positively and partially negatively charged (that’s what the 50/50 means). The charge of the beads attracts impurities and makes them “stick.” By itself, DI systems will purify water and meet your or your client’s expectations. A single DI filter can act as a stand-alone system because it can remove the smallest impurities from the water. With that said, working with a multi-stage system allows your DI filter to work with the other filters and therefore last significantly longer. In Multi-Stage, DI is the last filter, and it polishes off the final 5% left behind by the RO.

CS– Carbon Sediment. The CS filter is two different filters usually grouped together. The sediment filter removes any sediment or larger impurity from the water before it moves to the other filters.

The Carbon filter is critical for multi-stage systems. The filter is typical in drinking water filters because it removes foul odors, a small amount of sediment, and (most importantly for our purposes) chlorine. In a WaterFed® system, it is vital to take out all impurities for the expected results. However, it is crucial that it remove chlorine before the water reaches the RO filter because it is not chlorine tolerant. By removing the larger impurities and chlorine, the RO and DI filters will thrive.

Are there any other WaterFed® terms you’d like to know? Comment Below.