SkinTrendTower 28 SOS Daily Rescue Spray Review: Is It Worth the Price?
Tower 28 SOS is the cult hypochlorous acid face spray with a National Eczema Association seal. Here's its formula, pH, sizes, price, and cheaper alternatives.
Tower 28’s SOS Daily Rescue Facial Spray made hypochlorous acid famous. It has a three-ingredient formula, a skin-friendly pH of 4.5 and the National Eczema Association’s Seal of Acceptance. It’s also the priciest per ounce of the popular HOCl sprays. Is that premium worth it?
At a glance
| Tower 28 SOS Daily Rescue Facial Spray | |
|---|---|
| Sizes | 1 oz travel, 4 oz standard, 16 oz refill |
| Price (4 oz) | $28 (Tower 28 and Sephora list price) |
| Price per oz (4 oz) | about $7.00 |
| Ingredients | Water, hypochlorous acid, sodium chloride |
| pH | 4.5 (per the National Eczema Association listing) |
| Recognition | National Eczema Association Seal of Acceptance |
What’s in it
Like other good HOCl sprays, SOS keeps it minimal: water, hypochlorous acid and salt. What sets it apart is the pH of 4.5, close to the skin’s natural slightly acidic pH, and the National Eczema Association (NEA) Seal of Acceptance. The NEA reviews products for ingredients known to irritate eczema-prone skin. The seal doesn’t mean the product treats eczema, but it’s a useful signal if your skin reacts to a lot.
Tower 28 doesn’t prominently publish its HOCl concentration, so you can’t compare it with Prequel directly on strength.
Who it’s for
- Eczema-prone, very sensitive or reactive skin
- People who value the NEA seal and are willing to pay for it
- Anyone wanting a refill option to reduce plastic waste (16 oz refill)
Pros and cons
Pros
- NEA Seal of Acceptance
- Skin-friendly pH of 4.5, stated by the NEA listing
- Minimal, fragrance-free formula
- Travel and refill sizes
Cons
- Most expensive per ounce of the popular options
- Concentration isn’t prominently published
- The core ingredient is the same as in much cheaper sprays
How it compares
| Spray | Size / price | Price per oz | HOCl | Standout |
|---|---|---|---|---|
| Magic Molecule | 8 oz / $20 | ~$2.50 | 0.018% (retailer listing) | Cheapest per oz |
| Prequel | 8 oz / $29 | ~$3.63 | 0.02% (brand) | Brand publishes its concentration |
| Tower 28 SOS | 4 oz / $28 | ~$7.00 | Not stated | NEA seal, pH 4.5 |
The refill size usually lowers the price per ounce. Check current pricing at the retailer.
How to use it
Mist onto clean skin, or over makeup, with your eyes closed, and let it dry. It can also be used on the body. See Hypochlorous Acid Spray for Face for the full how-to, and the Routine Builder for where it fits.
Verdict
Tower 28 SOS is the “safe bet” for very sensitive or eczema-prone skin, thanks to its NEA seal and stated pH. If those matter to you, the premium is reasonable. If you just want hypochlorous acid on your face, cheaper sprays with a similar three-ingredient formula, like Magic Molecule or Prequel, will do the same basic job for less.
Sources
- Tower 28 official product page, checked November 2026. tower28beauty.com
- National Eczema Association product listing (ingredients, pH, seal). nationaleczema.org
- Sephora US product listing (price), checked November 2026. Sephora