How to choose a hypochlorous acid generator: batch vs. continuous, volume and concentration, testing, water and installation needs, warranty, and how Eco One, Hypo 7.5 and EWCO 300 compare.
The short answer
Start with how much solution you need and how you'll use it. Then compare generators on published output (volume at a stated concentration), how you'll check each batch, water and installation requirements, consumables, warranty, and support. A home user making a liter at a time has very different needs from a facility that needs a steady flow.
First, understand what a generator is (and isn't)
Under the EPA's guide to pesticide devices:
- Hypochlorous acid/electrolyzed water generators are generally considered devices. They don't require EPA registration unless they're sold or distributed with a substance, and the EPA notes that circumstances like that, or using a generator as part of a sanitization service, can change how it's treated.
- Registered pesticide products, such as many bottled sanitizers and disinfectants, carry an EPA Registration Number.
- The EPA distinguishes pesticide devices from registered chemical products. An EPA Establishment Number identifies the facility where a product was produced; it is not a product registration, approval, or endorsement.
- Device claims can't be false or misleading, and some states have their own requirements.
- The EPA recommends that electrolyzed water generated by these devices not be ingested or applied to the human body.
What this means when shopping: a generator's specifications describe what the machine makes. They don't, on their own, establish what a solution is authorized or proven to do for a particular use. Follow the manufacturer's manual, and for commercial uses, confirm the applicable requirements for your setting.
Step 1: Batch or continuous?
- Batch generators fill a container, run a cycle, and produce a set volume. They suit homes and intermittent use.
- Continuous-flow systems produce solution as water flows through, at a rate tied to concentration. They suit facilities that need solution throughout the day and are usually plumbed in.
Step 2: Size by volume at the concentration you need
Output is only meaningful with a concentration attached. Look for published time or flow figures at specific ppm values, and remember that manufacturers' ppm figures are approximate; the Eco One manual notes that ppm values vary with water quality. For a continuous system, concentration and flow are linked; the EWCO 300 page lists output from 200 ppm at 1.5 L/min down to 50 ppm at 6.0 L/min with standard salt additive.
Choose the concentration your intended use and the manufacturer's directions call for. Don't pick a model, or a setting, on "stronger is better."
Step 3: Check how you'll test each batch
Ask whether test supplies are included and what range they read. Free-chlorine test strips give an approximate concentration reading, and pH strips show acidity. Neither proves that a surface has been sanitized or disinfected, and pH alone doesn't tell you concentration. All three models below list test paper in the box.
Step 4: Look at ingredients, water, and installation
- Ingredients: Use only what the manual specifies. Preparing a batch with manufacturer-specified ingredients (for example, the optional vinegar step in the Eco One manual) is different from mixing a finished solution with other cleaners, which you shouldn't do; the CDC says not to mix products or chemicals with each other.
- Water: Some systems have feedwater requirements. The EWCO 300 warranty lists water hardness below 80 ppm and routine water-filter replacement among the owner's responsibilities.
- Installation: Countertop units plug in. Plumbed systems may need a qualified installer; the EWCO 300 warranty requires installation by a competent, qualified person following applicable codes.
Step 5: Cell, warranty, and support
The electrolysis cell does the work, so ask what it's made of, its expected life, and what the warranty covers. Read what's excluded, such as wear parts or unapproved additives.
Step 6: Storage and safety instructions
Read the manual's precautions and storage guidance before you buy. Ask whether the manufacturer provides an SDS. For example, the Eco One SDS says to store solution in a cool area away from UV or direct sunlight with the container tightly closed, and its manual says the appliance should not be used by children and the power connector must be dry.
Our generators at a glance
Manufacturer figures as listed on November 7, 2026. For full specifications, stated conditions, installation and maintenance details, see Eco One vs Hypo 7.5 vs EWCO 300: Which Fits Your Volume? (proposed page).
| Type | Stated volume | Best fit | Listed price | |
|---|---|---|---|---|
| Eco One | Portable batch | 1 L per batch | Home and small spaces | US $199.99 |
| Hypo 7.5 | Batch | 7.5 L per batch | Larger batches without plumbing; manual says designed for commercial use | US $2,199.00 |
| EWCO 300 | Continuous flow, wall-mounted | 1.5–6.0 L/min (concentration falls as flow rises) | Facilities with plumbing, qualified installer, trained operator | US $4,999.00 |
The Eco One is our home generator. For commercial applications, see ewco.com.
A quick checklist
- How much solution do I need, and at what concentration?
- Batch or continuous?
- Are output figures published at specific ppm values?
- How will I test each batch, and are supplies included?
- What ingredients, water quality, and installation does it need?
- What does the warranty cover and exclude?
- Are the manual, SDS, and storage guidance available before purchase?
Questions about which model fits? Email service@hocl.com.
This guide is general information, not legal or professional advice. Always follow the manufacturer's manual.