Pond salt is one of the most versatile and effective tools in a UK koi keeper's arsenal. This pure, non-iodised aquatic salt reduces fish stress, aids recovery from disease and injury, improves gill function, and helps maintain electrolyte balance in pond water. Safe for koi, goldfish, and most pond plants when used at correct dosages.
Why Every Koi Keeper Should Use Pond Salt
Salt has been used in fishkeeping for centuries, and for good reason — it works. In a pond environment, a low-level salt solution (0.1–0.3% concentration) creates an osmotic advantage for fish, reducing the energy they must spend on osmoregulation (maintaining the right balance of water and salts in their bodies). This freed energy goes directly toward immune function, healing, and growth.
Pure Aquatic Grade: No Additives, No Iodine
Critically, not all salt is equal. Common table salt contains anti-caking agents and iodine — both harmful to pond fish and beneficial bacteria. Our pond salt is 100% pure sodium chloride, mined from natural deposits and processed to aquatic-grade purity. It dissolves cleanly without clouding water or affecting pH, and leaves no harmful residues.
Key Features
- ✅ Pure non-iodised aquatic salt — no harmful additives
- ✅ Reduces fish stress — improves osmotic balance
- ✅ Aids recovery — supports healing after disease or injury
- ✅ Improves gill function — better oxygen transfer
- ✅ Controls parasites — inhibits many external parasites at higher doses
- ✅ Safe for koi & goldfish — used at correct dosage
Product Specifications
| Feature |
Detail |
| Salt type |
Pure sodium chloride (NaCl) |
| Iodine content |
None (non-iodised) |
| Anti-caking agents |
None |
| Grade |
Aquatic / fishkeeping grade |
| Suitable for |
Koi, goldfish, most pond fish |
| Available sizes |
1kg, 2.5kg, 5kg |
Pond Salt Dosage Guide
| Purpose |
Concentration |
Amount per 1,000L |
| General maintenance |
0.1% |
1kg per 1,000L |
| Disease recovery / stress |
0.2% |
2kg per 1,000L |
| Parasite treatment (short-term) |
0.3% |
3kg per 1,000L |
Always dissolve salt in a bucket of pond water before adding. Never add undissolved salt directly near fish.
Frequently Asked Questions
Is pond salt safe for all pond fish?
Pond salt is safe for koi and goldfish at the dosages recommended above. Avoid high concentrations (above 0.3%) for extended periods. Some sensitive aquatic plants may be less tolerant — research your specific plants before treating.
Does pond salt evaporate or need topping up?
Salt does not evaporate — only water evaporates. When you top up your pond after evaporation loss, you don't need to add more salt. Only replace salt after a significant water change that dilutes the existing concentration.
Will pond salt affect my biological filter?
At maintenance concentrations (0.1%), salt has minimal effect on beneficial bacteria. At treatment concentrations (0.2–0.3%), some bacterial activity may slow temporarily. Maintain excellent filtration and aeration during any salt treatment.
Can I use table salt instead of pond salt?
No — never use table salt in a pond. Table salt contains iodine (toxic to fish) and anti-caking agents that can harm beneficial bacteria and pond life. Always use purpose-made aquatic pond salt.
How do I measure salt concentration in my pond?
Use a salt refractometer or aquatic salinity test kit. These give accurate percentage readings so you can maintain safe, effective concentrations.
🚚 Free UK delivery | 📦 Dispatched within 1 business day | 💬 Expert pond advice available
