www.123filter.com | (678) 261-7611 sales@ispringfilter.com Page 4What is DI filter?DI stands for deionization. De-mineralize filter takes the full size RO to a higher level of filtration. It is an excellent inline filter,especially those who live in areas with exceptionally high levels of TOTAL DISSOLVED SOLIDS (TDS) in their tap water.The post deionizer takes the small percentage of contaminants that the membrane could not remove and filters this togreater than 99.99% pure. It will give you close to 0 ppm TDS, Conductivity attainable less than 0.1uS/cm or resistively ofclose to 18 meg.ohmWhat is UV filter?Our UV filter comes with 11W UV sterilization lamp in a stainless still housing. UV kills 99% of virus and bacteria. The UVlight of wavelengths between 250 and 270 nanometers (UV-C or UVC band) is extremely effective in killing many species ofbacteria, mold spores, viruses and other microorganisms. UV filter is recommended for customers who uses well water, rainwater, or has bacteria concern on their water.What is a TDS meter?A TDS meter is a Handheld Total Dissolved Solids Tester. Total Dissolved Solids are the total weight of all solids that aredissolved in a given volume of water, expressed in units of mg per unit volume of water (mg/L), also referred to as parts permillion (PPM). With a TDS meter, you can easily compare the quality of RO water with your original source water.Maximum distance from tank to faucetA maximum distance from tank to faucet of 15 feet is possible. The system will produce a faster flow at the faucet with theshortest tubing run from tank to faucet.