duraleigh said:
I bet you will find VERY little difference....within the margin of the test itself, I think.
I am not taking on the bet, but I will do the experiment if someone else takes the bet
JasonLion said:
The precision of the test, when done correctly, is around plus or minus 15 for levels up to 90 and plus or minus 30 for levels between 100 and 200. Novices often have problems reading the test correctly, and tend to get higher than actual readings.
I'll do my best.
JasonLion said:
We have had several people having problems with lower than actual readings with cold water because they did not allow enough time for the reaction to run to completion. The standard instructions to mix for 30 seconds is not enough time when the water is cold. You can either mix longer, or warm up the sample to room temperature. My solution is to warm the sample first and then use 30 seconds. Waterbear always recommends allowing two minutes for the CYA test reaction to complete before reading the results, and doesn't bother with warming the sample.
Here is a start at a proposed test method...
I will need to do this in the dead of night so my beautiful wife doesn't see me using her fridge :taped: . First, I plan on removing the milk jugs and stuff to make room in the fridge. Next I will attempt, again under the cover of darkness :batman: , to draw water from pool using a tube the gets down near the bottom of pool between ice and wall to retrieve sample. I will bring the sample indoors and place it in the fridge. I will also place the mixing bottle, view tube and R-0013 into the space I have created in the fridge. I will fill the mixing bottle to the proper level with the pool water. Then I will let all of that stabilize in the fridge for about an hour...the fridge is at ~38F. Next, using insulating gloves, I will dispense the proper amount of R-0013 into the mixing bottle while keeping all components inside the fridge compartment :rambo: . Here is where I have a bit of a challenge as my speedstir's circuit board saw too much water and no longer works correctly
...but I was thinking of putting in a clean (small) stir bar into the mixing bottle and letting is spin for a bit...maybe I can steal a stir plate from work this weekend. My thought was letting it mix for 5 minutes. The next part is also tricky, since I must do this in the dead of night :batman: and in the fridge, I was thinking of finding a flashlight app for my phone that will simulate outdoor light. I think I will place the tube on white paper and have the phone light the sample from one side. Then I will dispense the test solution into the tube until the dot disappears. At that moment I will test the temperature with a quick read thermometer and then note the value. I think I will repeat this 3 times by pouring the sample back into the mixing bottle and always handling everything with insulating gloves. After getting 3 measurements at ~38F (or whatever the quick read thermometer tells me), then I will allow the pool water sample and all the equipment warm to room temperature. We keep our house at ~65F in the winter, so I might need to bump up the temp to 70+...again, must do this at night as to not be observed :batman: . I will repeat the test (3 times) also mixing for 5 minutes and attempting to simulate the same lighting conditions as in the fridge (this will be challenging...maybe I need to go back into the fridge just when I fill the tube to simulate the same lighting conditions, of course still measuring temperature with the quick read thermometer). I am also considering corrupting one of my sons
, and getting two different eyes looking this giving us two sets of numbers. I better look to see how much R-0013 I have...
Thoughts?...
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