Using an HOCl Fogger with Solution You Make

Using an HOCl fogger with solution you make is an equipment task: you make and test a batch, then pour that batch into the sprayer’s tank and apply it to surfaces as the unit’s manual describes. This page covers the handheld electrostatic cold fogging sprayer, sold on its own and with the Eco One in the Eco One + sprayer bundle. It is a guide to tank fill, charging, and refill math. It is not a claim about what the spray does in the air or to a whole room.

HOCL LLC sells machines and this sprayer. It does not sell bottled HOCl. Make the solution first, using How to Make Hypochlorous Acid at Home.

What the unit is, and what it is not

The current store page lists the unit as a handheld, battery-operated electrostatic cold fogging sprayer with a 1.8 L (0.5-gallon) tank. This guide covers filling it only with HOCl you have made and tested. “Cold fogging,” as the store describes it, means the unit does not heat the solution in the tank.

What it is for, in this guide: distributing already-made, already-tested HOCl onto surfaces, as an alternative or a supplement to an 8 oz spray bottle when you have more area to cover than a trigger bottle comfortably handles.

What it is not:

• It is not a reason to skip the wash pass. Visible soil still comes off first, with detergent and water, as in any other surface routine on this site.
• It is not a claim of room-wide results, air treatment, or a substitute for wiping surfaces you can reach with a cloth.
• It is not a second generator. It does not make HOCl. If the tank is empty, you need another tested batch from the machine.

Follow the included user manual for assembly, charging, fill level, and spray pattern. This page does not replace that manual. Spray only onto surfaces, never toward a person, a pet or a face, and keep people and pets out of the area while you spray.

Make and test the solution first

Use the Eco One as the default machine: fill the 1.5 L pitcher only to the 1 L line, run the 200 ppm or 500 ppm recipe in the how-to, and check ppm and pH before you pour anything into the tank. The target pH is 5–6. The papers, and the 1:5 method if you have made a 500 ppm liter, are in HOCl PPM and pH Basics.

Do not pour an untested batch into the tank. Do not use or store a batch below pH 4; chlorine gas can be released. Do not put the Eco One’s potassium hydroxide cleaner in this sprayer. This guide covers HOCl only.

Never mix HOCl solution with ammonia, bleach, strong acids or other cleaners; mixing with ammonia can release chloramine gas, and mixing with strong acids 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).

If you regularly need more than a liter at a time, the Hypo 7.5 makes a 7.5 L (2-gallon) batch. Specs and when to step up in volume are on Choosing an HOCl Generator and compare.

Tank fill and charging

From the current store how-to and specification list:

• Fill the 1.8 L tank with the HOCl you have already tested. Do not overfill past the tank’s own fill mark, if one is present; otherwise, leave a little headspace and close the tank as the manual shows.
• Charge the battery before a long job. The store lists a 20V detachable lithium-ion battery (2,500 mAh), about 3 hours for a full charge, and about 30 minutes of continuous use. The charger is listed as 110V/220V compatible.
• Choose a spray pattern. The store describes a dual-pattern nozzle with two flow modes.
• The store’s how-to says to spray from about 3 feet and to follow the included manual.

Empty and rinse the tank when the job is done, following the included manual, so dried solution does not sit in the nozzle. Recap any leftover HOCl in a closed, light-protected jug rather than leaving it in an open tank; storage conditions are in HOCl Storage and Shelf Life.

The store also lists an empty weight of 2 lb (0.9 kg) and a full weight of about 6 lb (2.7 kg), and a spray projection of up to 10 feet, with about 3 feet listed as the working distance. Use those as equipment figures, not as a coverage claim.

Refill math

The useful numbers for planning are tank volume, batch volume, and how long the tank and battery last in continuous use.

Filling the tank from the Eco One. The tank holds 1.8 L. One Eco One run makes 1 L. A single liter fills the tank only part way. Two 1 L runs make 2 L, which fills the tank and leaves 0.2 L for a spray bottle or a top-up. If you only need a partial tank, one tested liter is enough; do not treat a full tank as a requirement.

Filling the tank from the Hypo 7.5. A 7.5 L batch is 7.5 ÷ 1.8 = 4 full tanks, with 0.3 L left over. That is a volume calculation only.

Emptying the tank. The store lists an atomization rate of 70 mL per minute. At that rate, 1,800 mL ÷ 70 mL/min is about 26 minutes to empty a full tank in continuous use, which is in the same range as the listed 30-minute battery time. In practice you will start and stop, so a tank may last a longer clock time than 26 minutes. Plan a second tested batch before you start a large job if you think you will empty the tank once.

These figures are refill planning, not a square-footage rating and not a result for a room. This page does not publish a coverage area.

A short equipment checklist

1. Charge the battery (about 3 hours for a full charge, per the store).
2. Make and test the HOCl. Confirm pH 5–6.
3. Pour into the 1.8 L tank. Plan two Eco One liters for a full fill.
4. Choose a spray pattern, work at the distance in the manual (the store how-to says about 3 feet), and apply to surfaces you have already washed.
5. When the tank runs low, refill from a tested jug, or run another liter.
6. Empty and rinse the tank. Recap leftover HOCl and store it as the storage guide describes.

Do not mix other cleaners in the tank. Do not add anything to the tank to “adjust” a finished batch.

Buying the unit

The sprayer is sold together with the Eco One in the bundle, and on its own in the HOCL store. The bundle’s current listing includes the Eco One, the 1.8 L sprayer, the battery and charger, test papers, an 8 oz PET fine-mist bottle, a microfiber cloth, and a sample of the Eco One’s potassium carbonate additive. Salt is not included; the Eco One recipe still uses food-grade, non-iodized kosher salt you supply.

Start with the Eco One if you are making 1 L batches at home. Add this sprayer when a trigger bottle is not enough tank volume for the surfaces you want to cover, not because the sprayer changes the solution. For the first liter, use the Eco One and the how-to, then fill the tank only with a batch you have already checked.