More and more pool and hot tub owners choose salt electrolysis systems as an alternative to traditional pool chemicals. This solution is convenient, effective and much gentler on the skin. However, there is one essential condition – using the correct type of salt. In practice, a common question arises: can salt with anti-caking agents be used? The answer is clear: no.
Why does the type of pool salt matter so much?
In salt-based systems, salt (sodium chloride – NaCl) is converted into active chlorine responsible for water disinfection. Any chemical additive other than pure NaCl disrupts the electrolysis process, negatively affects water chemistry and may lead to equipment damage.
What is real pool salt?
High-quality pool salt designed for pools and hot tubs is characterized by:
- ✅ NaCl content above 99.9%,
- ✅ no anti-caking agents or chemical additives,
- ✅ no mechanical impurities,
- ✅ stable grain size for fast dissolution,
- ✅ full compatibility with salt chlorinators.
Only such salt ensures safe bathing and long system lifespan.
What does anti-caking salt contain?
Road, industrial or table salt very often contains substances that are undesirable in pool water:
- ⚠️ anti-caking agents (e.g. sodium ferrocyanide E535, potassium ferrocyanide E536),
- ⚠️ metal impurities (iron, manganese),
- ⚠️ insoluble mineral fractions.
Why should anti-caking salt never be used in pools or hot tubs?
1. Damage to pool equipment
Chemical additives accumulate in key system components:
- ❌ accelerated corrosion of metal parts,
- ❌ clogged filters and pipes,
- ❌ shortened lifespan of electrolysis electrodes.
2. Water quality problems
Using impure salt may cause:
- ❌ cloudy water,
- ❌ foaming (especially in hot tubs),
- ❌ difficulty maintaining stable pH and chlorine levels.
3. Health risks
Although anti-caking agents are permitted in food in trace amounts, in pool water they:
- ❌ may irritate skin and eyes,
- ❌ increase the risk of allergic reactions,
- ❌ are particularly dangerous for children and people with sensitive skin.
Which salt is safe for pools and hot tubs?
Choose only salt that is:
- ✅ dedicated to pools and salt electrolysis systems,
- ✅ with minimum 99.9% NaCl purity,
- ✅ free from anti-caking agents and unnecessary additives,
- ✅ sourced from a verified manufacturer.
Summary
Using anti-caking salt in a pool or hot tub is a false economy that can lead to costly failures, poor water quality and health issues. Choosing pure pool salt is an investment in safety, comfort and system durability.
If you are looking for a product that meets the highest quality standards, choose Kamsol Premium® – pool salt without anti-caking agents, based on Polish raw material with NaCl purity above 99.9%.