In testing FC, I’m assuming testing with the 25 mark is more accurate than the 10 mark. How skewed might things get if I started using 10? I’m blowing through the DPD powder and reagent.
I've been told by more experienced folks here to think of it like this: It's really not an EXACT science.
If Pool Math says add 85 ounces of LC and I'm using a 16 ounce solo cup to add my chlorine, I DO NOT add exactly 5.3 solo cups worth of the stuff. I add 5 full cups, I might estimate about 1/3 or 1/2 another cup and call it a day. But that's just my opinion on the matter. LOL