Answer from OpenAi Chat GPT ...
Published by Water Network Research, Official research team of The Water Network
Answer from OpenAi Chat GPT 4:
Yes, non-biocidal anti-fouling paints are generally considered safe for use on large-scale raw water intake systems , including those used in water treatment plants , provided they are properly selected and certified for potable or process water applications .
✅ What Are Non-Biocidal Anti-Fouling Coatings?
Unlike traditional anti-fouling paints (which release toxic biocides like copper or organotins), non-biocidal coatings prevent fouling through physical means , such as:
Foul-release coatings (e.g., silicone or fluoropolymer-based): Make surfaces too slippery for organisms to attach.
Hydrophilic/hydrophobic surfaces : Alter surface tension to resist biofilm formation.
Ceramic or epoxy-based barrier coatings : Act as tough, inert layers that resist colonization.
🧪 Safety & Health Considerations
1. Human Health
These coatings do not leach toxic substances into the water.
Many are inert once cured and are chemically stable .
If certified for NSF/ANSI 61 (in the U.S.) or equivalent potable/process water certifications (e.g., DVGW, WRAS, ACS) , they are safe for human contact or indirect water exposure .
Important: Coatings must be fully cured and applied per manufacturer specs to avoid any unreacted residues.
2. Environmental Risk
Non-biocidal coatings are favored in sensitive ecosystems because they:
Don’t harm aquatic life
Reduce ecological load of heavy metals and toxins
Are often more durable , meaning less reapplication and waste
3. Application-Specific Caveats
These coatings are typically used on:
Pump internals
Intake pipelines
Screens and grates
Surface prep and correct application are critical to performance.
Not all products are equal— industrial marine-grade coatings are designed for harsh conditions (biofouling + abrasion).
Would you like help identifying specific products or suppliers that meet these criteria for river intake structures?
1 Comment
Yes please
Published by Kevin Horn, Brisbane City EnterprisesPty Ltd - Project Manager / Team Leader
1 Comment
Here’s a carefully curated list of non-biocidal anti-fouling coatings suitable for large-scale river intake pumps and other raw water structures, with attention to potable water safety and large-flow applications. I focus on real commercial products used in waterworks or hydropower plants worldwide.
1. Jotun – Jotun SeaQuantum Ultra
Type: Fouling-release, silicone-based coating
Mechanism: Very smooth surface prevents adhesion of algae and mussels
Potable water safety: Inert; low leaching; used on raw water intakes in Europe and Asia
Durability: 5–7 years in high-flow water, low maintenance
Supplier in Switzerland: Jotun Switzerland GmbH
2. Hempel – Hempasil X3 / Hempaguard X7 (Fouling-Release)
Type: Silicone-epoxy hybrid coatings
Mechanism: Fouling-release; physically prevents biofilm and mussel attachment
Certifications: Non-biocidal; inert, suitable for indirect contact with raw water
Use case: Pumps, intakes, submerged metal surfaces in water treatment plants
Supplier: Hempel Schweiz AG
3. International Paint – Intershield / Intersleek 900
Type: Silicone fouling-release coatings
Mechanism: Smooth surface, prevents macrofouling and biofilm
Potable water compatibility: Inert; widely used in hydropower intakes and freshwater plants
Maintenance: Minimal, periodic inspection sufficient
Distributor: PPG Switzerland / International Paint
4. Carboline – Carboguard 890 / Carboline 1340 Silicone Coating
Type: Silicone-based, non-biocidal anti-fouling coating
Mechanism: Fouling release, excellent in freshwater rivers with mussels and algae
Applications: Raw water intake screens, pump housings, and submerged pipelines
Notes: Carboline has experience in large municipal water intake facilities in Europe
Distributor in Switzerland: Carboline Schweiz AG
5. Local epoxy-based inert coatings (for potable water contact)
Some companies produce epoxy coatings approved for raw water contact:
ZinCo Aqua-Protect (DVGW/KTW certified) – suitable for potable water surfaces and raw water pumps
Krylon or Sika Epoxy coatings with NSF/ANSI 61 or DVGW certification
Use case: For surfaces that may have occasional direct contact with untreated water
✅ Key Selection Tips
Choose silicone-based fouling-release coatings for high-flow river intakes.
Check potable water certification if there’s any possibility of contact before treatment. Look for NSF/ANSI 61 (US) or DVGW/KTW (Europe).
Durability in freshwater: 5–7 years is realistic for large river intakes; maintenance may include annual visual inspection and mechanical cleaning.
Avoid adding biocides if you want zero environmental and human health risk.
Published by Water Network Research, Official research team of The Water Network