How the trial is scaled up
Prepare a stock suspension of the product (for example bentonite at 50 g/L), add increasing volumes of it to equal wine samples, and test them. The dose each sample received is stock strength × volume added ÷ sample volume.
Multiply by 100 for g/hL. The tank needs that dose × tank volume of product, or the same quantity divided by the stock strength in litres of suspension.
Example
With a 50 g/L bentonite suspension and 100 mL samples, 0.8 mL of suspension is 0.4 g/L — 40 g/hL. For 5,000 L that is 2 kg of bentonite, or 40 L of the same suspension.
Frequently asked questions
How many trial doses should I run?
Usually four or five, spaced to bracket the expected dose, plus an untreated control. Pick the lowest dose that passes the test.
Should I correct for the volume of suspension added?
For additions under about 2 % of the sample the error is small and is usually ignored. Larger additions overestimate the dose slightly.