Borate concentration ?

[PoolDoc]

20 mg/L = 20 ppm

... They're ok, but I never get a true color match...

Just one of the many problems with test strips. It worries me how many medical tests are done with strips, these days.

[Aprilszoo]

Oops... Like I said, I'm math-challenged...☺️

I hear ya on the reading of strips for medical tests. I remember when I was pregnant and my Dr's office had us patients dip a test strip ourselves in our urine. Then we were supposed to come out and put the strip on a piece of paper that had our name, the date, and the time of appt. Then we went back to the waiting room until they called us to get weighed and put in an exam room. It was at this point that the medical assistant would glance at the strip, toss it in the garbage and record the "results". I never saw her actually compare the strip to anything. Not that it was accurate at that point anyway... It was supposed to be read at intervals up to one minute, I think.... I know the colors changed while it laid there. Plus there's about 5 other problems with their method that I can think of.

I wonder how many extra lab tests had to be done because the reagent strips weren't used as designed.... Talk about wasted health care $$ ...

But I digress... Sorry...

Thank you for clarifying what chem geek said.... Reading it again, it shouldn't have needed any explanation.... Where do I report for my dunce cap?

Thank You, April

[PoolDoc]

Thank you for clarifying what chem geek said.... Reading it again, it shouldn't have needed any explanation.... Where do I report for my dunce cap?

My wife is a teacher, who works with elementary school children who aren't 'getting it', and also with the teachers who aren't 'getting it across'. You would be amazed at how many teachers also don't get it -- they've learned to crank the handles on lots of 'math black boxes', and they know which box to use, but they don't actually understand the math or its application.

For years, math has been taught as numeric manipulation, divorced the real world and practical application. The result has been that most adults fail to understand that math is just a way of seeing, and thinking about, certain aspects of the real world. Years ago, when I was hiring high school teachers for the summer to help me work with the large commercial pools I serviced, I was amazed at these college graduates who were stumped when asked to calculate, roughly, the volume (and weight) of water in, say, a 42' x 75' x 4' to 10' pool -- even after I'd showed them how. Most never learned. Even the math teacher I hired took 2 - 3 weeks to learn!

So, don't feel bad -- being 'math-challenged', with respect to practical applications of math, is totally normal among college educated American adults!