- Made in North Devon since 1973
- BSI Kitemark ready-mixed concrete
- Manufactured to BS EN 14992
- UK-wide & European delivery
Agricultural · dirty water · FETF-eligible
Dirty Water Tanks.
Sectional precast panels. Built chamber by chamber.
A sectional precast panel system for storing dirty water separately from slurry — yard washings, parlour washdown and contaminated runoff. The standard module is an 8ft (2.4m) wide by 8ft (2.4m) high panel, built up into a three-chamber, 25ft (7.6m) tank, or extended with additional chambers to order.
Panels go up one at a time on base pads, each joint sealed with mastic and pulled square with retaining bars. Once the run is standing, we cast the floor in situ and mortar the internal joints — same system whether it's a three-chamber tank or a longer run.
- · 8ft × 8ft panel module
- · 3-chamber standard (25ft)
- · Extendable chamber runs
- · Mastic-sealed joints
- · Site-cast floor
- · FETF 2026 eligible item
Specification
One panel module, built up as needed.
The tank is built from a repeating 8ft panel module. Three chambers is our standard configuration; longer runs use the same panels and joint detail.
| Variant | Size | Detail | Typical use |
|---|---|---|---|
| Standard panel module | 8ft × 8ft (2.4 × 2.4m) | Base pads + wall panel, joined on site | Repeating unit for every chamber |
| Three-chamber tank | 25ft long (7.6m) | 8ft × 8ft module × 3 chambers | Standard configuration |
| Extended runs | Additional 8ft chambers to order | Same panel and joint system, more chambers | Four-chamber and longer runs built to order |
Chamber-by-chamber capacity, concrete mix and any project-specific standards are confirmed with the order pack — send us the number of chambers and the site details and we will come back with a structural spec.
On site
How it goes together.
It's a panel build, not a single pour. Panels stand one at a time on base pads, each joint mastic-sealed and pulled square with retaining bars, and the floor is cast in situ once the run is standing.
- 1 Start on a firm, level surface — a compacted base or pre-cast tank pads.
- 2 Panels are stood one at a time on the base pads, each recess sealed with mastic before the next panel goes in.
- 3 A holding bracket fixes the first joint; retaining bars are inserted and tightened as each chamber squares up.
- 4 The sequence repeats along the run — mastic to every exposed recess, panel positioned, bars tightened.
- 5 Once every panel is up, bars are checked for tightness before the floor goes in.
- 6 A concrete floor is poured in situ and a sand-and-cement mortar is applied to the internal joints to finish.
Where they go
Common applications.
- · Dirty water storage separated from thicker slurry — yard washings, parlour washdown, roof and gulley runoff
- · Staged / multi-chamber settlement ahead of irrigation or further treatment
- · New-build and retrofit dirty water systems as part of an NVZ storage upgrade
- · FETF 2026-funded dirty water tank installations (Slurry theme — see our FETF 2026 guide)
- · Extensions to existing chamber runs using the same panel and joint system
From the field
A four-chamber tank, in the trench.
Configure your dirty water tank
Tell us how many chambers and where it's going — we will quote inside 24 hours.
Related products
Often ordered alongside.
Common questions
What people ask about dirty water tanks.
Five questions we answer most weeks. If yours is not here, ring the yard.
What is a dirty water tank, and how is it different from a slurry store? +
Dirty water tanks hold the more dilute effluent that has to be kept separate from thicker slurry — parlour washdown, yard scrapings runoff, roof and gulley water that has picked up contamination. Our tank is a sectional precast panel system, built from repeating chambers, rather than the thicker-walled cantilever panel system we use for slurry stores.
What sizes are available? +
The standard module is an 8ft (2.4m) wide by 8ft (2.4m) high precast panel, built up into chambers on site. Our concept drawing shows a standard three-chamber tank at 25ft (7.6m) overall length; more chambers can be added to the same run — the installation photo on this page shows a four-chamber tank built the same way.
How is it installed? +
It is a panel-based build, not a single monolithic pour. Panels are stood on base pads with mastic sealing every joint, holding brackets and retaining bars keep each chamber square as the run goes up, and a concrete floor is cast in situ once all the panels are standing, with a sand-and-cement mortar finish to the internal joints. Full step-by-step photos are in the installation guide download below.
Can chambers be added later, or is it a fixed size? +
Because it is a sectional panel system on a repeating 8ft module, a run can be extended with additional chambers using the same panels and joint detail — you are not locked into the original chamber count.
Is a dirty water tank eligible for grant funding? +
Dirty water tanks (50m³ reference size) appeared as an eligible item on the FETF 2026 Slurry theme list, mapped against our sectional precast tank. See our FETF 2026 eligible products guide for the full list and how the scheme worked.
Spec sheets
Concept drawing and install guide.
The 8ft three-chamber concept drawing and the panel-by-panel installation guide.
How would you like it?
Supply-only or fitted — Dirty Water Tanks
Supply only
Per-unit / per-metre supply
Lead time: 4–6 weeks
- 8ft × 8ft precast panels for the number of chambers ordered
- Base pads, holding brackets and retaining bars
- Mastic sealant for joint recesses
- Groundworks and trench excavation
- Site-cast floor concrete and jointing mortar
- On-site setting / fixing labour
Fitted (supply + install)
Supply + install crew
Lead time: 6–8 weeks (incl. site slot)
- Everything in supply only
- Panel erection, joint sealing and floor pour
- Retaining bar tightening and joint mortar finish
- Trench excavation and backfill
- Pipework and pumps
. Extended chamber runs beyond the three-chamber standard priced per chamber added.
Ready to spec it?
Send us the number of chambers and the site details. Quote and lead-time same day.