EWCO 300 continuous-flow hypochlorous acid system: production rates by flow, amperage and additive, feedwater and installation requirements, maintenance checklist, and warranty terms.
What it is
The EWCO 300 is a wall-mounted, continuous-flow hypochlorous acid system with a single-cell, non-membrane electrolysis design in a 316 stainless steel enclosure. Water flows through the unit while a pump doses salt-brine additive into the cell, producing HOCl on demand. EWCO is a brand of HOCL LLC. Listed price on November 7, 2026: US $4,999.00.
It's intended for facilities that need steady on-site production and that have a qualified installer and a trained operator; see the requirements below.
How concentration is controlled
The EWCO 300 manual says three variables control free available chlorine (FAC) concentration:
- Flow rate: set with the inlet shut-off/reducing valve. Higher flow lowers FAC; lower flow raises it. Minimum flow is 1.5 L/min (≈0.40 gal/min).
- Amperage: adjustable from 13 to 22 A. Higher amperage raises FAC.
- Pump speed: 0 to 19. Higher speed doses more additive. The manual recommends mid-range for most purposes.
The additive formula also changes output and the share of chlorine present as HOCl.
Production rates
These are the manual's guide charts. Per the manual, actual performance varies with additive formulation, pump speed, and water quality. Maximum concentration is reached only at the minimum flow rate and maximum amperage; higher flow means lower concentration.
| Flow rate | Formula 1 (salt + water) 17.5 A / 22 A | Formula 2 (salt + vinegar) 17.5 A / 22 A | Formula 3 (salt + water + HCl) 17.5 A / 22 A |
|---|---|---|---|
| 1.5 L/min (0.40 gpm) | 170 / 200 ppm | 136 / 160 ppm | 255 / 300 ppm |
| 2.0 L/min (0.53 gpm) | 127 / 150 ppm | 102 / 120 ppm | 191 / 225 ppm |
| 3.0 L/min (0.79 gpm) | 85 / 100 ppm | 68 / 80 ppm | 128 / 150 ppm |
| 4.0 L/min (1.06 gpm) | 74 / 75 ppm | 51 / 60 ppm | 95 / 112 ppm |
| 5.0 L/min (1.32 gpm) | 51 / 60 ppm | 41 / 48 ppm | 77 / 90 ppm |
| 6.0 L/min (1.59 gpm) | 43 / 50 ppm | 34 / 40 ppm | 64 / 75 ppm |
Additive formulas and pH (manual): - Formula 1, salt + water: pH ≈ 7–8; manual states over 25% of the chlorine is HOCl. - Formula 2, salt + 5% vinegar: pH ≈ 6–7; over 70% HOCl. - Formula 3, salt + water + hydrochloric acid: pH ≈ 5–6; over 90% HOCl. Requires safety goggles and gloves when handling HCl.
Prepare additives only as the manual specifies; this page intentionally doesn't reproduce quantities. Use pure salt with no iodine or anti-caking additives.
Never mix HOCl solution with ammonia, bleach, strong acids or other cleaners; doing so can release toxic chlorine gas. Add only the vinegar or additive your manual specifies, in the amount it specifies. If someone breathes in fumes or swallows solution, call Poison Help at 1-800-222-1222 (poisonhelp.hrsa.gov).
Installation requirements
From the manual and the product page warranty:
| Requirement | Specification |
|---|---|
| Mounting | Wall-mounted; securely fasten to the wall (brackets included) |
| Ventilation | Install in a ventilated area; the manual warns that small amounts of hydrogen, chlorine dioxide, and ozone can be released from solution and can be explosive if they accumulate, and that chlorine gas can form if pH becomes acidic |
| Heat | Not near heat sources over 400 °C (750 °F) |
| Feed water & brine hardness | Below 80 ppm (total calcium + magnesium) |
| Feed water & brine temperature | 10–30 °C (50–86 °F) |
| Ambient temperature | 5–50 °C (41–122 °F) |
| Humidity | Below 96% RH |
| Minimum flow | 1.5 L/min |
| Maximum water pressure | 87 PSI |
| Power | AC 110/220 V, 50/60 Hz, 180 W |
| Connections | Inlet ⅜ in; outlet ½ in; shut-off valve on the inlet line (fittings and tubing included) |
| Additive tank | 4 L; suction hose length inside tank 290–300 mm (≈11.4–11.8 in) |
| Installer | Competent, qualified person following local and national codes (warranty) |
| Operator | Designated responsible person with professional technical training (manual) |
| Filtration | Routine replacement of supply water filters (warranty) |
Holding tanks: The manual's Level mode is for connecting to a holding tank with a float sensor; the system stops when the float activates.
Pre-purchase checklist
- ☐ Test your feed water hardness; confirm it's below 80 ppm or plan treatment.
- ☐ Confirm you can sustain at least 1.5 L/min at no more than 87 PSI.
- ☐ Identify a ventilated wall location away from high heat, with power nearby.
- ☐ Decide which additive formula you'll use, and whether staff can handle HCl with PPE if you choose Formula 3.
- ☐ Size output using the table above at the concentration you need, not the maximum.
- ☐ Arrange a qualified installer and a trained responsible operator.
- ☐ Plan for test strips or a photometer to spot-check FAC.
Maintenance and refill checklist (from the manual)
- Confirm the unit is securely mounted and the area is ventilated.
- Check the inlet valve operates freely and flow stays at or above 1.5 L/min.
- Refill the additive tank before it runs dry (prevents Err 2). Power off, remove lid and hose together, fill, reinstall, power on, press RESET.
- Keep hose length inside the tank at 290–300 mm.
- Review amperage and pump speed settings.
- Spot-check FAC with test strips or a photometer against the manual's charts.
- Use the alarm table: Err 1 low flow, Err 2 low current, Err 3 high current, Err 4 low voltage, Err 5 fan error. Press RESET only after correcting the cause.
- Inspect the power cord; power off completely before removing any cover.
Testing
The product page lists chlorine and pH test paper in the box, with an optional digital chlorine photometer and pH meter. Test readings confirm approximate concentration and pH. They don't, on their own, show that a surface has been sanitized or disinfected.
What's in the box (manual)
EWCO 300 unit, US power cord, wall mount bracket, additive tank bracket, 4 L salt brine additive tank, push-fit elbows (⅜ in and ½ in), stem elbows, straight adaptor, shut-off valve, 1 m each of ⅜ in and ½ in tubing, and the manual. The product page also lists chlorine and pH test paper.
Warranty
Per the product page: HOCL LLC warrants the EWCO 300 for one year against defects in materials and workmanship under normal conditions. Covered components include power adapters, printed circuit boards, and electrolysis cells. Wear-and-tear parts (plumbing parts, solenoid valves, pumps) aren't covered, nor are additives not described in the manual, unapproved alterations, or failure to follow installation and operating instructions. Owner responsibilities include water hardness below 80 ppm, filter replacement, an additive strainer, and qualified installation.
Regulatory note
The EPA generally treats hypochlorous acid generators as devices, and notes that sale or distribution with a substance, or use as part of a service, can change that. This page makes no registration or compliance claim for this model. The EPA recommends that electrolyzed water from these devices not be ingested or applied to the human body.
Next steps
Questions about sizing or installation? Email service@hocl.com. For commercial applications, see ewco.com. Compare models in Eco One vs Hypo 7.5 vs EWCO 300.