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I mainly use the DR 820 for DPD free and total measurements. I have also used it to measure iron. The main reasons I got it were precision, portability (compared to a large spectrophotometer) and the ability to use Hach's Test 'N Tubes for the DPD. The reagent in the tubes is good up to 5.5ppm...

Figured I'd better start a separate thread with my data. First, information about my test configuration: Tank Equipment: 250 gallon cubicle IBC tank (plastic bulk tank w/ metal cage, sometimes called a pallet tank) with rectangular opening cut into the top. A plastic flap is used as a loose...

I'm doing a small-scale test in 250 gallon tank. Tank has a heater, pump, and filter. I added CYA to get near the top of the test kit range. On 5/6 the tank was about 95ppm of CYA, 3.20ppm total CL, 2.86ppm free CL, and 7.6 pH. Water temp is being maintained at 80 degrees. After taking my...

I have a bag of the stuff that I bought from Pool Supply World online. Currently doing a small-scale experiment, will share any conclusive results. Back of the bag says "...proprietary composite biocatalyst blend of all natural micro-organism cultures and enzymes in a nutrient powder."

Hi from Minnesota. After 5 years I've finally decided to quit being just a lurker. I had 15' and18' Intex pools for years and made lots of "textbook" newbie mistakes. You know the ones: Algae blooms from inadequate sanitation, followed by massive chemical additions I shouldn't have needed, and...