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Cleaning Chemical Calculator
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Stone Poultice Quantity Calculator

Poultice powder and liquid for a stain of a given area and thickness, from the powder density and the mix ratio.

Inputs

Range: 0.01–1,000 sq ft

Square feet. Cover the stain and a small margin beyond it.

Range: 0.0625–2 in

Inches. A quarter inch is the usual working thickness; a deep stain in a porous stone takes more.

Range: 10–200 lb per cubic foot

From the product data sheet. A diatomaceous earth and a clay powder are not the same weight for the same volume.

Range: 0.1–20

From the product instructions. The mix should be a paste, not a slurry.

Result

Liquid needed
5.0 fl oz
Powder needed
2.50 lb
Poultice volume
0.0417 ft3
Reading: what this result means for the job
A small mix that one person prepares in a bucket. Mix to a paste rather than a slurry, and keep the poultice damp under a cover for the whole dwell, because a poultice that skins over cannot draw the stain out.
Applicability limit
The powder and liquid follow the stain area, the thickness and the powder density entered. Powder density is a data sheet figure and the density of a diatomaceous earth and a clay are not the same, so weigh the powder rather than measuring it by volume. This is a planning figure for the values entered, not a measured result. Coverage rates, product yields and application rates are properties of a specific product, applicator and substrate, and the label or data sheet for the product you are using always takes precedence over the default here.
Check before the job

Working

Poultice volume
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Powder needed
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Liquid needed
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What to check

  • Take the powder density from the product data sheet.
  • Allow for the stain plus a small margin beyond its edge.
  • Check the mix ratio and the working time, since a poultice that skins over cannot be drawn off.

Related calculators

Poultice quantity follows from the volume you are filling and the powder density, and both are product figures. The mix has to be a paste rather than a slurry, so the liquid figure matters as much as the powder figure.