The Chlorine Speciation Curve: pH 3.5 to 5.5
In aqueous solution, free available chlorine exists in an equilibrium governed strictly by pH:
- At pH < 3.5, chlorine gas (Cl2) evolves, creating respiratory toxicity and skin burns.
- At pH 3.5 to 5.5, the solution is dominated (>95%) by pure Hypochlorous Acid (HOCl) — an uncharged molecule identical to that produced by human neutrophils to kill invading pathogens.
- At pH > 7.5, HOCl dissociates into the hypochlorite ion (OCl-), the primary alkaline active in household bleach, which severely disrupts the cutaneous lipid mantle.
Formulators must strictly buffer HOCl within pH 4.0 to 5.0 to maintain safety and bactericidal potency.
Tower 28 vs. Briotech vs. Prequel: Formulation Nuances
Tower 28 SOS Spray popularized HOCl for beauty consumers. It uses simple electrolyzed saline buffered at ~pH 4.5 to 5.0 with approximately 0.015% (150 ppm) HOCl. Its National Eczema Association seal verifies non-sensitization.
Briotech utilizes a patented electrochemical process producing pure HOCl without excess unreacted sodium chloride, minimizing potential osmotic drying on chronic eczema plaques.
Prequel Universal Skin Solution packages HOCl in larger, cost-effective apothecary-style bottles with an ultra-fine continuous mist actuator, making it superior for body acne and chest folliculitis coverage.
Takeaway: Never mix HOCl with wet Vitamin C or antioxidants; the potent oxidizing power of HOCl neutralizes them on contact. Wait 3 to 5 minutes until HOCl dries bone-dry before applying your routine.
Shelf-Life, Degradation & Storage Rules
HOCl naturally degrades back into salt water over 6 to 12 months. Exposure to UV sunlight and high temperatures accelerates this decomposition exponentially.
Always store HOCl sprays in opaque bottles away from direct bathroom sunlight. Discard the bottle once the characteristic faint swimming pool/chlorine aroma completely disappears, as this signals total conversion into inert saline.