Aquaflow
The UK's complete plastic drainage brand. Rainwater systems, underground drainage, and soil & waste — all manufactured in Birmingham to the highest standards.
30+ Years of Drainage Expertise
Aquaflow is Kalsi Plastics' drainage brand — covering everything from the gutter at the roofline to the pipe beneath the ground. Every Aquaflow product is manufactured at our Birmingham facility, compounded in-house, and tested to British and European standards. When you specify Aquaflow, you're specifying products with a direct line back to the manufacturer.
Three Complete Drainage Systems
12 Systems Rainwater Systems
12 complete gutter and downpipe systems — from domestic half round to high-capacity commercial. BS EN 12200 compliant with flow rates up to 6.0 L/s.
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Kitemark Certified Underground Drainage
110mm and 160mm Kitemark certified systems for domestic and commercial foul and surface water drainage. BBA certified 50+ year service life.
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3 Jointing Systems Soil & Waste
Three jointing options — push-fit, solvent weld, and ring seal. 32mm to 160mm. Complete above-ground drainage solution for residential and commercial.
View RangeAvailable in 6 Colours
Through-colour pigmentation — no painting, no fading, no maintenance.
Built to Last. Backed by British Manufacturing.
BS EN 12200 Compliant
Full regulatory compliance across all rainwater systems.
Kitemark Certified
Independently tested and certified to BSI standards.
UV Stabilised
Co-extruded high-gloss finish for lasting colour and appearance.
10-Year Guarantee
Product guarantee backed by UK manufacturer — no middlemen.
UK Manufactured
100% produced in Birmingham — consistent quality, reliable supply.
BBA Certified
Certificate 09/4705 — independently confirmed 50+ year service life.
Specify with Confidence
Free technical tools to help you calculate the right Aquaflow system for your project.
Rainwater Flow Calculator
Calculate required gutter capacity to BS EN 12056-3. Enter roof area and rainfall intensity to find the right system.
Open CalculatorDrainage Flow Calculator
Select the right underground drainage pipe size using the Colebrook-White equation. 110mm or 160mm?
Open CalculatorSpecify Aquaflow on Your Next Project
Talk to our technical team about the right Aquaflow system for your application — domestic or commercial, above ground or below.