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Conducting a demand test for use of PP
A demand rate is the amount of PP required to react with all of the
organic matter in the water sample collected from the system in need of treatment. To do a demand test using 5 "like" containers such as 1 quart MAson jars, collect an equal amount of water from system in each jar. This process uses an interval of 15 minutes time to determine the demand. This value is then multipled by 2 to give the recomended treatment rate. using the stock solution of 1000mg to one liter of water and mix thouroughly. The stock solution mentioned in a prevcious post can be used to make this 1000mg / Liter solution. In the 5 samples of water add, 2, 4, 6, 8 and 10 Ml of stock solution. Mix thouroughly. Wait 15 minutes. The test treatment that has the "slightest" faint pink color is the rate you want to use. If in doubt use the sample as to the rate which still has the slightest pinnk color and always cloose the sample with the lowest rate. Example: After 15 mninutes the 2 mg sample turned brown. but the 4mg sample stil had a faint pink color The 6mg samples and up are still a dark purple.....based on colors the 4mg rate is the correct choice......for demand. Now multiply that number (4) by 2 and you get a recomended dose of 8mg/L as the correcdt dose rate. PP is effective in oxidizing organics in water, treating fungal infections by knocking out the external fungas growths, but antibiotic may still be needed. All fish even species that tolerate it well may not tolerate PP, so its wise to have acounter method or reversing the action of PP. Hydrogen peroxide is very effective at this and will imediately turn water back to a clean when added. It does however take a fair amount of Hydrogen peroixide to reverse PP action. Dechors also are capable of reversing PP's action. Info obtained from the University of Florida. ------- I forgot more about ponds and koi than I'll ever know! |
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