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Concrete Washout Basin Solidifier Dosage Calculator

Calculate the amount of solidifying agent needed to treat a concrete washout basin's liquid waste, based on the product's manufacturer-labeled dosage rate.

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  • Every formula cited
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SettingsSettings for this calculationUS
Market
Imperial · sales tax
The total liquid volume currently held in the concrete washout basin.

The default of 1892.7 L corresponds to 500 gallons.

The solidifier product's labeled dosage rate, in pounds of product per 100 gallons of washout water.

This rate is product-specific — take it directly from your solidifier product's manufacturer label or data sheet, not a generic assumption.

Solidifier product needed

125 lb

Medium confidence

The dosage rate is entirely product-specific — always use the exact rate from your solidifier product's manufacturer label or data sheet, not an assumed default. Regardless of solidifier choice, construction stormwater permits (NPDES general permit requirements) require washout water to be fully contained on-site and never discharged to storm drains or waterways.

Washout volume
500 gal
Then change the inputs to see how far the answer moves.

Show calculation logic

How this was calculated

Formula source(s)

  • Product needed = (Washout Liquid Volume ÷ 100 gal) × Manufacturer's Dosage Rate (product amount per 100 gallons). Concrete washout solidifier dosage rates are product-specific and must come from the manufacturer's label/data sheet — this calculator applies whatever rate you supply. Construction stormwater general permits (NPDES) require concrete washout water to be contained on-site and not discharged, which is the regulatory driver for treating/solidifying washout water before disposal.

Inputs used

Washout Basin Liquid Volume
500 gal
Manufacturer's Dosage Rate (lb per 100 gal of Washout Water)
25

Intermediate steps

Washout volume
500 gal
Final result125 lb

Confidence note: The dosage rate is entirely product-specific — always use the exact rate from your solidifier product's manufacturer label or data sheet, not an assumed default. Regardless of solidifier choice, construction stormwater permits (NPDES general permit requirements) require washout water to be fully contained on-site and never discharged to storm drains or waterways.

What this calculation does not cover

  • The dose is only right for the volume in the basin at the moment it is measured. An open washout is also a rain gauge, and every rinse of a chute or a pump adds more, so a quantity weighed out in the morning under-treats by the afternoon. Dose against the liquid present at the time of treatment, and keep enough freeboard that a storm cannot put the basin over the side.
  • Solidifying is not neutralizing. Washout water usually sits around pH 11 to 13 from free lime, and a polymer binds the water without moving the pH at all, so what is left is a caustic solid. Where a permit or a receiving facility sets a pH limit, that is a separate treatment with carbon dioxide or acid and a separate measurement.
  • This weighs the product going in, not the waste going out. What leaves the site is the water, the settled fines and hardened solids already sitting in the basin, and the polymer together — a considerably heavier load than the liquid alone — and the haul, the container and the landfill's acceptance criteria are all priced against that mass.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Computed in your browser — nothing you enter is uploaded. Presented in US customary units and US trade terminology. Where a formula follows a published standard, that standard and its edition are cited beside it on this page; where none governs, the page says so. Local amendments override model codes — verify against the code in force where you build.

Sources checked 2026-09-06 · in the site-wide review of 2026-09-06 · v1.0.1

Regulatory standards & verification citations1
  1. Product needed = (Washout Liquid Volume ÷ 100 gal) × Manufacturer's Dosage Rate (product amount per 100 gallons). Concrete washout solidifier dosage rates are product-specific and must come from the manufacturer's label/data sheet — this calculator applies whatever rate you supply. Construction stormwater general permits (NPDES) require concrete washout water to be contained on-site and not discharged, which is the regulatory driver for treating/solidifying washout water before disposal.
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Your workspace

Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Tools and safety for this job

To place and finish concrete, erect formwork and saw-cut cured concrete. Generic types, no brands, no prices.

Protection this work requires

  • Cutting or grinding concrete, masonry, screed, tile or fibre-cement board releases respirable silica: cut wet or extract at the tool, and wear a P2/N95 respirator at minimum — a nuisance dust mask does not filter it.
  • Hardwood dust is a recognised carcinogen: extract at the tool and wear a P2/N95 respirator when cutting or sanding indoors.
  • Wet cement and lime burn skin and eyes painlessly until the damage is done: waterproof gloves to EN 374, safety glasses whenever the mix can splash, and never kneel in wet mix in permeable trousers.
  • Saws, grinders and breakers run above 85 dB, where hearing damage accumulates and does not recover: defenders or plugs for every cut, not just the long ones.
  • Breakers and grinders cause permanent nerve damage: limit continuous trigger time, keep hands warm, and stop if fingers tingle or blanch.
  • Boards, blocks and bagged material cause most lasting back injuries on small sites: two people or a lifter for full sheets, and never a bag on one shoulder up a ladder.
Show the 17 tools this job needs

Essential

  • Angle grinder

  • Bull float and edger

  • Circular saw

  • Claw hammer

  • Dust extractor or vacuum with a fine filter

  • Screed bar or rail

  • Shovel and spade

  • Spirit level

  • String line and pins

  • Tape measure

  • Wheelbarrow

Recommended

  • Chalk line

  • Cordless drill/driver

  • Floor or cut-off saw

  • Plate compactor

  • SDS rotary hammer

Optional

  • Power float

Also needed as materials: chalk refill, circular saw blades, cutting and diamond discs, diamond blades, drill and driver bits, SDS bits and chisels.

what each concrete tool is for, and the spec that decides which to buy where one does.

Now that you have the number

These guides cover the work this quantity is for — the first ones run this calculator inside the section that raises the question.

  • Ordering Concrete for a Column Pouruses this calculator

    A column lift is under ten cubic metres and has no tolerance either way: short leaves an unplanned joint, long leaves concrete you have to dispose of.

  • Setting Up the Waste Compound on a Siteuses this calculator

    The wagon lays out a waste compound, not the skips — and the caustic washout that no container will take needs its own lined corner of it.

How to calculate concrete washout basin solidifier dosage in 3 steps

  1. Washout Basin Liquid VolumeThe total liquid volume currently held in the concrete washout basin.
  2. Manufacturer's Dosage Rate (lb per 100 gal of Washout Water)The solidifier product's labeled dosage rate, in pounds of product per 100 gallons of washout water.
  3. Solidifier product neededThe tool computes the solidifier product needed from those figures and shows the formula, its sources, and a confidence rating alongside it.

Solidifier product needed by washout basin liquid volume

Page defaults, not your figures above.

Washout Basin Liquid VolumeSolidifier product needed (lb)
200 gal50
400 gal100
600 gal150
800 gal200
1,000 gal250

Frequently asked questions

Where does the dosage rate come from?
The dosage rate is entirely product-specific and must come from your solidifier product's manufacturer label or data sheet — this calculator simply applies whatever rate you supply, it does not determine the correct rate for your product.
Why is concrete washout water treated instead of just discharged?
Construction stormwater general permits (NPDES) require concrete washout water to be contained on-site and not discharged to storm drains or waterways, which is the regulatory driver for treating/solidifying it before disposal.
How is the product amount calculated from a volume in liters?
The liquid volume is first converted to gallons, then divided by 100 and multiplied by the manufacturer's dosage rate (given in product amount per 100 gallons), since the dosage rate convention is expressed per 100 gallons of washout water.
Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — a confirmed fix gets a permanent check of its own, so the same mistake cannot come back.