FluidWater

The Fluid Water range spans from small domestic units of a few hundred litres up to large industrial and agricultural tanks holding tens of thousands of litres. Sizing depends on intended use — a household rainwater harvesting system needs far less capacity than a farm slurry or bunded fuel store. Our team can help match tank volume to daily demand or catchment area if you're unsure.

Many models in the range are designed specifically for underground burial and are rated to withstand groundwater pressure and soil loading, provided they're installed per the manufacturer's guidelines. This usually means correct backfill material, a concrete base or anchoring straps to prevent flotation, and adequate cover depth. Always check the specific tank's datasheet, as not every model is rated for burial — some are above-ground only.

Fluid Water tanks are typically manufactured from polyethylene (MDPE or HDPE), a rotationally moulded plastic that's lightweight, corrosion-resistant and doesn't suffer the gel-coat degradation issues sometimes seen with fibreglass over time. Polyethylene tanks are generally easier to handle on site and cost-effective for standard shapes, whereas GRP tends to be chosen for bespoke or very large-capacity builds. Both are suitable for potable and non-potable use provided the correct WRAS-approved material is specified.

Most domestic water storage tanks don't require planning permission, but below-ground installations connected to drainage or sewage systems fall under Building Regulations (Part H) and may need Building Control sign-off. If the tank forms part of a septic tank or treatment plant discharge, you'll also need to check Environment Agency (or SEPA/NRW) permit requirements. It's worth confirming with your local authority before digging, particularly near watercourses or boundaries.

Standard sizes are often available for prompt dispatch, while larger or bespoke tanks may take longer as they're built to order — we'll confirm lead times at point of order. Delivery is usually via kerbside HIAB or crane-offload lorry for bigger tanks, so you'll need clear, firm access and someone on-site to direct positioning. It's worth arranging manpower or plant in advance, as most tanks over a few hundred litres are too heavy or awkward to move by hand.

Yes, many tanks in the range are dual-purpose and suited to rainwater harvesting, greywater storage, irrigation or general non-potable use, though they're not automatically fitted with the pumps, filters or float switches needed for a harvesting system. If you're setting up a harvesting installation, you'll typically need to add a first-flush diverter and appropriate pump kit separately. Check the tank's spec sheet to confirm inlet/outlet configuration suits your intended pipework layout.