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k40
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k40

The HydroFLOW® K40 is designed for pools, hot tubs, spas, ponds and water features. It treats limescale, reduces bacteria, and improves filtration for clearer, cleaner water with less maintenance. With simple clamp-on installation, no plumbing changes, and compatibility with all pipe types, it works continuously on both hot and cold water systems.

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The HydroFLOW® K40 improves water quality in pools, spas and ponds by reducing bacterial levels, cutting down chlorine demand, and enhancing filtration efficiency. This means clearer, more pleasant water, reduced maintenance, fewer backwashes and lower running costs. The unit is easy to install on existing pipework simply clamp it in place, no plumbing changes required.

Features

  • Up to 63 mm OD (≈ 2½”)

  • Designed for small swimming pools and hot tubs.

  • Has option for plug-in or hardwired installation. No pipe cutting needed.

  • Contact us for pricing

Related products

Commercial Product
Suitable for pools, hot tubs, spas, ponds and water features
Suitable for Pipe Sizes up to 63 mm
3-year Manufacturer’s Guarantee
Kinder to Skin and Hair

Improves Filtration Efficiency

The K40 encourages fine particles to cluster together, making them easier for your filter to catch. This improves filtration, reduces backwash frequency and saves water.

Protects Your Applicances

Enhnace Water Clarity

The HydroFLOW® signal helps fine particles cluster so they can be removed more easily, resulting in cleaner, clearer water for a better bathing and swimming experience.

Kinder to Skin and Hair

Cuts Down Chlorine Use

Less chlorine is needed to maintain safe water, reducing both costs and unpleasant odours while creating a more enjoyable swimming or bathing experience.

Keep Healthy Minerals in Water

Minimises Limescale Buildup

Helps keep heating elements, pumps and filters free from limescale buildup, protecting equipment and keeping systems efficient.

Protects Your Applicances

Maintenance Free

No filters, chemicals or consumables required. Once installed, the K40 runs continuously in the background with no ongoing upkeep.

Kinder to Skin and Hair

Eco Friendly and Safe

Lower chlorine demand, fewer backwashes and improved efficiency mean reduced operating costs and a smaller environmental footprint.

Reasons to Buy HydroFLOW® for Your Swimming Pool

CHEMICAL-FREE WATER TREATMENT

Protects systems from limescale without the need for salt or harsh chemicals, reducing chemical handling and storage requirements.

REDUCE OPERATION COSTS

Keep boilers, chillers, and water systems scale-free and efficient. Lower energy use and reduce costly maintenance callouts.

MINIMISE DOWNTIME

Cleaner systems mean fewer breakdowns and less unplanned servicing, so your operations run smoothly.

ECO-FRIENDLY SOLUTION

Save water, reduce waste, and protect the environment with a sustainable treatment method.

Proudly Made in Britain

Engineered and manufactured in the United Kingdom. Trusted worldwide

  • Every HydroFLOW® unit is designed, built, and tested at our UK facility — upholding the global reputation of British manufacturing for trust, precision, and performance.

Certified to meet rigorous international standards

  • We adhere to strict ISO guidelines, CE marking requirements, and NRTL approval standards, so you can be confident in our product’s safety, durability, and compliance.

Full traceability across our entire production chain

  • From design to delivery, every stage is traceable and documented — supporting transparency, quality assurance, and accountability.

Committed to sustainable and ethical manufacturing

  • We prioritise environmentally responsible processes, reduce waste, and embrace long-term sustainability to minimise our impact on the planet.
Feature
HydroFLOW k40 unit HydroFLOW® k40 Best for private pools, spas and hot tubs
Application Residential pools, spas and hot tubs
Pipe size compatibility Up to 63 mm (2.5") outside diameter
Typical use Private swimming pools, spas and hot tubs
Installation Clamp on fit, no pipe cutting and no flow interruption
Power supply Standard 110–240 V (low wattage)
A – Hardwired 3 A fused spur
B – UK plug transformer
LED indicators Single red LED confirms operation
Limescale treatment ✓✓
Signal strength Medium output
Recommended use Private pools, spas and domestic hot tubs
Warranty 3 year manufacturer’s warranty
Purchase options Contact sales
HydroFLOW k40 unit
HydroFLOW® k40
Best for private pools, spas and hot tubs
Application
Residential pools, spas and hot tubs
Pipe size compatibility
Up to 63 mm (2.5") outside diameter
Typical use
Private swimming pools, spas and hot tubs
Installation
Clamp on fit, no pipe cutting and no flow interruption
Power supply
Standard 110–240 V, low wattage.
A – Hardwired 3 A fused spur
B – UK plug transformer
LED indicators
Single red LED confirms operation
Limescale treatment
✓✓
Signal strength
Medium output
Recommended use
Private pools, spas and domestic hot tubs
Warranty
3 year manufacturer’s warranty
Purchase options
Contact sales