Pool and Tank Chemical Dosing

From dose to product quantity

This calculator converts an established active ingredient dose into a commercial product quantity. It does not select an appropriate dose. Multiply water volume by dose to obtain active mass, then divide by the product mass fraction. Divide product mass by liquid product density to obtain the volume to feed.

Example and limits

Adding 10 mg/L to 100 m³ of water requires 1 kg of active ingredient. A product containing 20 percent by mass requires 5 kg, or 4 L at a density of 1.25 kg/L. These are example values. The continuous mode performs the same conversion as a feed rate. Reaction demand, residual concentration, mixing and contact time require separate assessment.

Convert mass to volume for continuous feed

For a continuous dosing example, choose water flow of 12 m³/h, added dose of 5 mg/L, active ingredient content of 10 % and product density of 1.2 kg/L. Water flow is first expressed as 12000 L/h. Active ingredient demand is 12000 × 5 = 60000 mg/h, or 0.06 kg/h. Product mass feed is 0.06 / 0.10 = 0.6 kg/h. Liquid product feed is 0.6 / 1.2 = 0.5 L/h. These are illustrative inputs, not a recommended chemical dose or a claimed product property.

If dose is already defined on an active ingredient basis, do not apply product concentration to that dose a second time. Product mass percent and active ingredient per unit volume are different expressions. For a prepared solution, both concentration and density must refer to the final solution. Constant product feed does not guarantee constant dose if water flow changes. The calculated liquid flow does not directly give a pump setting percentage. Check actual delivery by a separate measurement. This preliminary calculation does not establish chemical demand, degradation or contact time. Assess dose suitability, product information and application conditions separately before making an operating decision.

Frequently asked questions

How do you calculate chlorine dosage per litre?

For an example litre of water receiving 10 mg/L active chlorine, a product with 20 percent active content by mass and density 1.25 kg/L requires 0.04 mL. Divide active mass by product fraction and density. This preliminary conversion uses illustrative dose and product values, is not a recommended dose for drinking water or pools, and does not determine reaction demand, residual chlorine or contact time.

Calculate with these values