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Water Filtration for Restaurants & Food Service
Commercial water filtration for restaurants, cafés, bars and food service: softeners that keep scale off dishwashers, steamers and espresso machines, carbon filtration for chlorine and taste, RO for ice and coffee water, UV for private-well kitchens, and sediment pre-filtration for ice machines. Built to the kitchen's flow and water test on Clack and Fleck valves, shipped nationwide; trade pricing on multi-location and repeat orders. What each piece of equipment needs, sized by seats and water test, below the products.
Water treatment for a commercial kitchen
Water is an ingredient in food service and it's also the main thing that kills the equipment. Hardness scales the dishwasher booster heater, the steamer, the combi oven and the espresso boiler; chlorine and chloramine flatten coffee and tea and corrode stainless; sediment plugs ice-machine solenoids and distribution tubes. Health codes care about the ice machine and the well supply; the equipment warranties care about hardness. The result is that most kitchens need two or three stages, sized to peak flow rather than to the building.
| Equipment | What hurts it | Treatment | Target |
|---|---|---|---|
| Commercial dishwasher, booster heater | Hardness scales the booster element and spray arms; spotting on glassware | Softener on the kitchen supply | Under 3 gpg (most manufacturers), ideally 0–1 |
| Steamers, combi ovens, kettles | Scale on heating elements; manufacturers void warranty above stated hardness and TDS | Softener; RO blend on high-TDS supplies | Per manual: typically under 3 gpg and under 100–200 ppm TDS |
| Espresso machines, coffee brewers | Scale in the boiler; chlorine and chloramine in the cup | Carbon filtration always; softening or RO-and-blend by TDS | SCA: 50–175 ppm TDS, 1–5 gpg hardness, 0 chlorine |
| Ice machines | Sediment in solenoids and tubes; scale on evaporator plates; cloudy ice from TDS; chlorine taste | 5-micron sediment plus carbon at the machine; softener or RO if scale is the complaint | Clear, 5-micron filtered, chlorine-free; TDS under 200 for clear cubes |
| Beverage dispensers, soda fountains | Chlorine and off-tastes; sediment in carbonators | Carbon and sediment on the dispenser line | 0 chlorine, 5-micron |
| Kitchen on a private well | Coliform exposure; iron and sulfur staining and odor | Iron/sulfur filter, softener, UV sized to kitchen peak flow; annual bacteria test | UV dose 40 mJ/cm² (NSF 55 Class A) at peak flow |
Sizing by the kitchen, not the building
Restaurant water use swings hard: almost nothing mid-afternoon, then dishwasher, prep sinks, ice makers and the bar all at once on a Friday night. Size the softener and filters to that peak, in gallons per minute, and the softener's capacity to gallons per day so it regenerates overnight when the kitchen is closed. As a starting point:
| Operation | Peak flow | Daily water | Softener |
|---|---|---|---|
| Café / coffee shop, no dish machine | 5–8 GPM | 200–500 gal | Residential-grade WS1 or 5600 SXT, 32–48K, plus carbon at the espresso machine |
| Quick service, under 60 seats | 10–15 GPM | 800–1,500 gal | WS1 or 5600, 64–80K; or 1.25″ valve if the main is 1.25″ |
| Full service, 60–150 seats | 15–35 GPM | 1,500–4,000 gal | 1.5″ commercial: Clack WS 1.5 EE or Fleck 2815, 120–210K |
| Large restaurant, hotel kitchen, banquet | 35–60 GPM | 4,000+ gal | 1.5″–2″ or twin alternating so there's never a hard-water window |
Food service water treatment: Clack and Fleck side by side
| Stage | Clack | Fleck |
|---|---|---|
| Softener, café to quick-service (to ~15 GPM) | Clack WS1 (from $1,319) | Fleck 5600 SXT (from $879) |
| Softener, full service (35–60 GPM) | Clack WS 1.5 EE (from $3,999) | Fleck 2815 (from $5,399) |
| Backwashing carbon, chlorine/chloramine for the whole kitchen | Backwashing Carbon Filter (from $1,099; specify catalytic carbon for chloramine) | Fleck 2510 AiQ Backwashing Carbon (from $1,199) |
| Ice machine and dispenser pre-filtration | Big Blue housing, 5-micron, ¾″–1.5″ (from $156); add a carbon cartridge for taste | |
| RO for coffee, steam and ice water (high TDS) | Crystal Quest Commercial RO, 500–7,000 GPD (from $3,447) with blending valve to the SCA target | |
| UV for a kitchen on well water | VIQUA Pro 10 (10 GPM; from $3,175) · VIQUA Pro 20 (20 GPM; from $3,840); NSF 55 Class A validated | |
Order of treatment and where it goes
Sediment, then softener, then carbon on the main kitchen supply; point-of-use sediment-and-carbon at each ice machine and dispenser; RO as a dedicated line to the espresso machine, steamer and ice maker where TDS is the complaint, with a blending valve so the water isn't stripped to zero. On a well, iron/sulfur treatment goes ahead of the softener and UV goes last, on clear water. Install softeners with a bypass so the kitchen keeps running during service. We build systems to the water test and the equipment list and ship assembled; freight to a dock or liftgate for 1.5″ and larger.
Frequently asked questions
Does a restaurant need a water softener? If hardness is above about 3 gpg and you run a dish machine, steamer or combi oven, yes; the equipment manuals specify it and scale is the leading cause of booster-heater and steamer failure.
What filter does an ice machine need? At minimum a 5-micron sediment cartridge and carbon at the machine. If cubes are cloudy or the evaporator scales, the problem is TDS or hardness and the fix is a softener or RO upstream, not a bigger cartridge.
Can one system serve the whole kitchen? The softener and carbon can. Ice and coffee usually get an additional point-of-use stage because their targets (clear ice, SCA water) are tighter than a dishwasher's.
Should we use RO for coffee? Only if TDS is high (over ~200 ppm) or the water tastes off after carbon. RO water alone is too soft and flat for extraction; it's blended back to 75–150 ppm. On moderate city water, carbon plus a softener set to leave 1–3 gpg is the usual answer.
Do you work with multi-unit operators? Yes. Send the equipment list, a water test for each site and peak-hour covers; we'll spec each site and quote trade pricing.
Quote a kitchen: request a quote with your water test and equipment list, or call 800-374-2143. Related: commercial water softeners · commercial filtration & RO · commercial UV · carbon filters.
