New China Shop Topic: How Accurate is the Pool Calculator?

[waterbear]

People, we are losing sight of the fact that we are talking about a swimming pool and the amount of water in the pool needs to be accurately known (and not rounded off to the nearest 1000 gallons or so) or this all become moot.
It's a swimming pool, not a science experiment and in the real world we are just splitting hairs here that are not important. Now I am the first one that insists in precision and accuracy when doing a scientific experiment (lest anyone forget I have a very similar scientific background like chem geeks) BUT you need to take in account your largest margin of error (which in our case would be the volume of water in the pool) and not try and get a precision smaller than this limiting factor because it is invalid! Yes, I know that errors are cumulative but if we are talking about errors that differ on such a significant order of magnitude they become insignificant!

We also have to take into account the precision of our testing methods and any errors introduced by our testing methodology.

What it boils down to is that the 'guestimate' that CarlD provided of one gallon of liquid chlorine adds approx. it's strength of FC to 10000 gallons of water is about the amount of precision that we can expect in real world situations of pool maintenacne and it is most certainly close enough for our purposes of maintaining a pool.

(If anyone is old enough to remember using triple beam balances or balance pans remember that the weight is taken after three equal oscillations of the pointer and not when the pointer had come to rest. This is my point, you have to realize what the limit of your precision is.)