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THE BASICS of SFR

THE BASICS of SFR. Spotting is caused by mineral salts, TDS (total dissolved solids), which are left behind when water evaporates. Spot Free Rinse water must have less than 40 ppm of TDS. Our preferred is 25 ppm of TDS or less. Average TDS range in the U.S. is 330–410 ppm.

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THE BASICS of SFR

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  1. THE BASICS of SFR • Spotting is caused by mineral salts, TDS (total dissolved solids), which are left behind when water evaporates. • Spot Free Rinse water must have less than 40 ppm of TDS. Our preferred is 25 ppm of TDS or less. • Average TDS range in the U.S. is 330–410 ppm. • Softeners do not remove any TDS. • Spot Free Rinse = More Happy Customers! Spot Free Rinse Systems - working to keep your reputation spotless

  2. TDS EXAMPLES FOR Common TDS Levels Spot Free Rinse Systems - working to keep your reputation spotless

  3. WHAT YOU SHOULD KNOW About Your Water Supply Before Getting a Spot Free Rinse System • Total Dissolved Solids (TDS) • Hardness • Iron • Is water chlorinated or non-chlorinated? • pH • Temperature Variation Spot Free Rinse Systems - working to keep your reputation spotless

  4. TERMINOLGY FOR Reverse Osmosis Spot Free Rinse Systems - working to keep your reputation spotless

  5. INSTALLATION SCHEMATIC Spot Free Rinse Systems - working to keep your reputation spotless.

  6. REVERSE OSMOSIS TREATMENT PRETREATMENT • Pretreatment of the feedwater is generally required to eliminate damaging or fouling the RO membrane. • Softening to remove hardness minerals which can scale membrane (for over 25% RO recovery). • Carbon adsorption for free chlorine removal to protect TFC membranes. Chloramines OK. Should be backwashing type to avoid biofouling and prolong effective life of carbon. • 5 micron sediment removal. • Chemical feed of colloidal dispersants if silica, alum, silt, and/or polyelectrolytes are present in enough concentration. • Municipal water supplies are more than prone to fouling than ever before due to excessive use of Flocculants and anti-corrosion chemicals that raise ph. Colloidal fouling can occur very rapidly and results in loss of production without much decrease in rejection. Spot Free Rinse Systems - working to keep your reputation spotless

  7. REVERSE OSMOSIS TREATMENT RECOVERY • Recovery: the efficiency of an RO system in terms of water use. • The percentage of feed water separated out as pure water. • Water chemistry dictates dictates how much you can recover. • With softened water and well designed system, you should be able to recover 50% and avoid fouling. • At 50%, the RO system operates very cost effectively with regard to water use, energy, salt, heat, etc. • In terms of recovery, reject to product ratios are: 50% - 1:1 25% - 4:1 33% - 2:1 16.6% - 5:1 29% - 3:1 • For 500 GPD systems and larger, anything less than 33% recovery is very wasteful and costly. With increasing frequency states are regulating water usage. Spot Free Rinse Systems - working to keep your reputation spotless

  8. Facts About Setting the Percent Recovery REVERSE OSMOSIS TREATMENT • The recovery setting should be dictated by the water conditions. • temperature • pH • hardness • ion composition • TDS • silt density index • The key is to set the “percent recovery” so the impurities don’t permanently deposit on the membrane surface. * Understand that these are general rules that are not 100% correct in all cases Spot Free Rinse Systems - working to keep your reputation spotless

  9. Facts About Setting the Percent Recovery REVERSE OSMOSIS TREATMENT • Understand that these are general rules that are not 100% correct in all cases Spot Free Rinse Systems - working to keep your reputation spotless

  10. OPERATING GUIDELINES FOR Reverse Osmosis Systems • Change prefilter cartridge every 90 days minimum • Lubricate motors yearly • Test for free chlorine weekly • Test for soft water daily – Test Strips, Test Kit • Monitor weekly (minimum): • Flow rates • Operating pressure • Feedwater temperature • TDS (total dissolved solids) • Check clock and settings on GAC filter Spot Free Rinse Systems - working to keep your reputation spotless

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