Refurbishment services

Our services

What is water tank refurbishment?

Water tank refurbishment involves repairing, relining, or upgrading existing water storage systems to restore performance, prevent leaks, and ensure compliance with UK water safety regulations. Over time, tanks can deteriorate through corrosion, scaling, or structural movement, increasing the risk of contamination and non-compliance.

At Complii, we provide expert water tank relining and refurbishment solutions using advanced solvent-free polyurethane coatings. These WRAS-approved systems deliver exceptional durability, chemical resistance, and flexibility, ensuring long-term protection for cold-water storage tanks, cooling towers, and other liquid-retaining structures. All work is completed in accordance with the Water Supply (Water Fittings) Regulations 1999, ACoP L8, and HSG274.

Why choose Complii?

How we can help.

Protect your people, property, and business. Here’s why we’re the right choice for refurbishment.

Fully compliant and WRAS approved

Our coatings and installation methods comply with the Water Supply (Water Fittings) Regulations 1999 and WRAS approval, ensuring your refurbished tank meets all safety and hygiene standards.

Long-lasting protection

Solvent-free polyurethane coatings provide a tough, easy-clean finish that resists corrosion, impact, and chemical attack, extending your tank’s operational lifespan.

Enhanced flexibility and performance

With a high flexibility rating (over 35%), our coatings accommodate natural structural movement—something traditional resin or epoxy coatings cannot achieve—reducing the risk of cracking or delamination.

Suitable for multiple materials

Our systems bond superbly to steel, concrete, GRP, and other substrates, making them ideal for a wide range of storage applications, from drinking water tanks to cooling towers and reservoirs.

Environmentally friendly and solvent-free

Our polyurethane coatings are completely solvent-free, providing a safer, more sustainable refurbishment solution that minimises odour and environmental impact.

Certified installation and guaranteed performance

Every refurbishment is carried out by experienced engineers in accordance with Water Research Council and ACoP L8 guidance. We’re so confident in our coatings that we guarantee them for up to 10 years.

Your questions answered.

Tanks should be refurbished if corrosion, leaks, or damaged coatings are identified during inspection. Regular assessments as part of your water hygiene programme will help determine the right time for intervention.
We refurbish a wide range of tanks, including steel, concrete, and GRP cold-water storage tanks, cooling towers, and other liquid-retaining structures.
In many cases, relining is a more cost-effective and environmentally responsible alternative to full replacement, extending the life of existing assets without major disruption.
Yes. All coatings used are WRAS approved and suitable for use in potable water applications.
Absolutely. In addition to refurbishment, we can supply and install new insulated tanks fitted with lids, insect screens, warning pipes, and correctly positioned outlets to ensure full compliance.
Project timescales vary based on tank size and condition, but we aim to complete most refurbishments within a few days, minimising downtime wherever possible.

Refurbishment.

What is water tank refurbishment?

How we can help.

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