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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.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Solidifier product needed

125 lb

Check your inputs

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

Running these inputs gives 125 lb as the solidifier product needed. Note that washout basin liquid volume sits at the low end of the range this calculator was checked against, so treat the output as indicative rather than settled. Expect some drift against the real job; the calculation is solid but conditions on site are not. Currently reading for United States under IRC 2024 — pick a different market above and the figures re-cast accordingly.

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.

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 — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • 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.

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.

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.