duoPUR Acid Purification System		Save up to 90% on your cost of ultrapure acids. The duoPUR, a quality sub-boiling distillation system, can produce up to 1 liter of high-purity acid from reagent grade stock in about six hours.
Cost Savings Calculator Fill in the following three variables:
1. Average Liters of ultra-pure acids you use per month:	Liters
Example: If you process 250 samples a month, using 30 mL of ultra-pure nitric acid per sample, then you use 6L of ultra-pure acid.
2. Your cost per liter for ultra-pure acid:	$ / Liter
If you know the cost of the acids you actually use, enter that. If not, you can refer to the following table for approximate costs.
Sample Acid Pricing UltraPure Grade per L Reagent Grade per L Nitric $419.42 $23.53 Hydrochloric $463.24 $19.98 Sulfuric $517.65 $22.89 * Sample pricing taken from the 2002/2003 Fisher Catalog; compares OPTIMA vs. Certified ACS Plus grade.
3. Your cost per liter for reagent-grade acid:	$ / Liter
Again, if you know the cost of the acids you actually use, enter that. If not, you can refer to the table above for approximate costs.

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1. Take the list price of the instrument and divide by 12—that is your monthly cost.^*
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3. At the end of 12 months, with the final payment of $1, the unit is yours.