Concrete Washout & Slurry Containment

Concrete washout and slurry intercepted where wagons, pumps and rigs are washed out: the bag holds the solids while they settle and set, and drains the water, which stays alkaline and stays the site's responsibility.

Ready-mix plants, concrete frame and groundworks contractors, pump-hire firms, precast yards and piling contractors. The buyer is usually a site or plant manager who needs the wash point to move with the work and cannot build a fixed washout pit.

Stop concrete washout, pump-line cleanout water and similar slurry reaching drains, ground or standing water, and take the set solids out as one liftable mass.

The bag sits at the wash point, on the ground or in a support frame, and washout is discharged into it from a chute, a hose or a pump line. Solids settle and set inside the bag while water drains through the base and side panels. Once the contents have set, the bag is lifted away whole and a spare bag takes its place, so the wash point keeps working. At a piling rig, a pump cleanout point or a precast yard the wash point moves with the work and the bags move with it.

Where the water goes is the controlling risk: washout water is alkaline and carries fines, so a bag that overflows, splits or is set where the base cannot drain puts that water into drains or ground. The set material is heavier than the wet volume suggests, so loops and any frame are sized on the set load rather than the pour. Chutes and pump lines discharge at whatever rate the wash produces, so the top of the bag has to take impact and splash. Bags that stand outside for weeks need UV-stabilised fabric, and a bag that is reused at several wash points is handled far more often than one that stays in place.

Size the bag from the volume one wash produces and how often it is emptied, not from a stock list. Where the wash point moves with the work, several smaller bags are easier to swap than one large one. If the site's permit requires a lined or bunded washout facility, the bag sits inside that arrangement rather than replacing it. Tell us how the drained water is collected, because that decides whether the base needs a collection tray or liner under it. Where a support frame is used, send its dimensions so the bag is made to sit in it.

This page covers fabric bags for concrete washout, pump-line cleanout water and similar slurry at wash points on ready-mix, precast, piling and general building sites. It is not a treatment or neutralisation system: the water that drains from the bag is still alkaline washout water, and its capture, storage and discharge stay with the site under its own permit. Hazardous and contaminated waste is not covered. Size and drainage behaviour are confirmed per project against the customer's own washout.