And Does Quality Really Matter?
When it comes to water softener salt, cheaper isn’t always better. Like most products, a lower price often reflects lower quality, but many people assume salt is just salt. Unfortunately, that misconception can lead to serious problems for your water softener and expensive repairs.
Is Cheap Water Softener Salt Really a Problem?
Yes. Poor-quality salt tablets can break down inside your water softener, releasing contaminants and creating sludge in the brine tank. This can block components, reduce efficiency, and even cause system failure, leading to avoidable repair costs and downtime.
The image below shows the inside of a water softener brine tank where poor-quality salt tablets have failed. The tablets have broken down and released contaminants into the system, ultimately leading to a costly repair.
Low-quality salt may also crumble during transport or storage. It produces dust and fines that interfere with the softening process and increase maintenance requirements.
The second image below illustrates the difference in quality between different sources of salt. All of the salt in this picture is brand new straight from the bag. The “Beige” salt on the left side is from a Solar Evaporated Sea Salt source manufactured in the Middle East. The White salt on the right was manufactured in Northern Europe from PDV (Pure Dried Vacuum) and using BS 998 / EN973 Type A as the minimum standard.
Not All Water Softener Salt Is the Same
The biggest factor affecting salt quality is the raw material (feedstock) and how it is manufactured. Different salt sources have very different purity levels and contamination risks.
Common Salt Types and Typical Quality
Rock Salt
- No consistent manufacturing standards
- Possible contaminants: mud, stones, gravel
Sea Salt
- No universal purity standards
- Possible contaminants: sand, organic material, debris
Solar Salt
- No consistent global standards
- Possible contaminants: sand, minerals, organic remains
Food Grade Salt
- Minimum 97% sodium chloride (NaCl) under Codex standards
- Can be produced from any of the above sources
- May still contain significant impurities
While “food grade” sounds reassuring, it can legally contain up to 3% impurities — that’s around 750 grams of non-salt material in a 25kg bag.
The Highest Quality Option: PDV Salt
Pure Dried Vacuum (PDV) Salt, manufactured to BS 998:1990 or EN973 Type A, is widely considered the best choice for water softeners.
Key benefits include:
- Minimum 99.6% NaCl purity
- Strict limits on contaminants and impurities
- Consistent tablet strength and performance
- Cleaner operation and fewer maintenance issues
Although PDV salt may cost more upfront, it helps protect your equipment and can reduce long-term service costs.
What Makes a High-Quality Salt: Tablet or Block?
Beyond purity, manufacturing quality plays a major role in performance.
1. Particle Size Distribution
Properly graded salt particles create stronger tablets that resist crumbling and reduce dust formation.
2. Compaction Pressure
Well-compressed tablets are stronger and produce fewer fines. Lower manufacturing pressure reduces production costs — but often results in weaker, lower-quality products.
3. Moisture Content
Some low-cost salt is made from undried material, meaning part of what you pay for is water rather than salt. Higher moisture content also causes tablets to break down more easily.
4. Salt Creep and Efflorescence
Poorly manufactured salt absorbs excess brine, leading to “fluffy” growth on tablets. Over time, this can cause:
- Salt bridging (salt forms a solid mass)
- Blockages in cabinet softeners
- Systems appearing full but not softening water
Salt bridging is a common cause of service callouts and is typically not covered under manufacturer warranties.
Cheap Salt vs Quality Salt: The Real Cost
Low-cost salt may seem like a saving at checkout, but the hidden costs can include:
- Increased maintenance and cleaning
- Reduced water softener efficiency
- Salt bridging and blockages
- Component damage and repairs
- Shortened system lifespan
Investing in high-quality PDV water softener salt helps ensure reliable performance, cleaner operation, and long-term protection for your equipment.
Need Advice on Choosing the Right Water Softener Salt?
If you’re unsure which salt is best for your system, getting expert advice can help you avoid costly mistakes. Choosing high-purity, well-manufactured salt is one of the simplest ways to keep your water softener running efficiently and reliably.