Drinking Water Antifreeze for Your Boat
Biodegradable antifreeze for your boat's drinking water system. Protects pipes and tanks from frost damage. Based on propylene glycol — non-toxic, fully biodegradable and safe for all common materials including PVC, PE, stainless steel and rubber.
Step-by-Step: Winterising Your Drinking Water System
- Empty the water tank completely
- Fill the tank with antifreeze
- Run the pump until antifreeze comes out of all taps and outlets
- At the start of the season, flush the entire system thoroughly with fresh water
Biodegradable vs. Ethylene Glycol
| Property | Propylene Glycol (biodegradable) | Ethylene Glycol |
|---|---|---|
| Toxicity | Non-toxic | Toxic |
| Biodegradable | Yes | No |
| Safe for drinking water | Yes | No |
Related products: Boat maintenance | Boat accessories
Frequently Asked Questions
Can I use regular car antifreeze?
No — car antifreeze is ethylene glycol-based and toxic. Only use biodegradable propylene glycol for drinking water systems.
How much antifreeze do I need?
For protection down to -15 °C, use undiluted and run the pump until antifreeze appears at all outlets.
When should I add the antifreeze?
Before the first frost — ideally in October. Don't wait until temperatures drop below zero.
Is it safe for all materials?
Yes — safe for PVC, PE, stainless steel and rubber.
In stock? Order today before 17:00 for same-day dispatch. Otherwise as soon as possible. Questions about the right product for your boat? Our specialists in Joure are happy to help.
