Quote Originally Posted by hamop78 View Post
I test every batch of bleach I buy ---- Using 1000 ml (1 Liter) of UNCHLORINATED water (from a well or distilled), place .1 ml of the sample from your bleach bottle -- mix and test.

As for the dilution method for testing bleach I use a 1000 ml volumetric flask and a medical syringe used to perform the standard tuberculin “Tine” test. The syringe has a total capacity of 1 ml but is graduated in .01ml graduation intervals with major graduations at .1ml. The dilution method is accurate within .1 ml @20 deg C.
Testing is done using the FAS-DPD method, using a 25ml sample size, again yielding accuracy within .2 ppm in a 10000 to 1 dilution.

I have found the results to be repeatable with a 95% confidence level (in scientific terms [95 out of 100 tests]).

The results of the test is equal to the percentage of bleach.

Hey, anybody can do it with THOSE tools!

(just kidding! )

The reason I used the 1.8ml and 5 gallon bucket is that Ben's PS-232 kit has a measure that really close to what you need--and EVERYONE can get a 5 gallon bucket.

Another idea: Lots of infants' medicines have eyedroppers marked off in ML, some with exactly 1.0 ML. Take one from a used-up or expired bottle, and mix it with 10 liters of water. (wash it first! )

10 liters???? What's that???? Why, that's five 2-liter soda bottles! --in that good old reliable 5 gallon bucket. You probably have at least one 2-liter bottle in your recycling right now.

What you lose in precise measuring that hamop78 does will be gained by using ten times as much water and bleach, so your results should be as accurate as his. But you don't look as cool!