Why can’t I add my acid to heated water?

Bru'n Water users may have noted that the program tells them to add their acid to the water before its heated. Here is the reason why you should heed that recommendation or revise your process.

When we have an accurate tap water report, the amount of acid calculated for the acidification dose is based on the alkalinity from that report. When you heat water, you start reducing that alkalinity. Adding the acid dose that was calculated based on the original alkalinity means that you will end up overdosing the acid.

However, it is OK to add acid to hot water, but you will need to determine what the alkalinity of that heated water is in order to properly calculate the acid dose. If you prefer adding acid to your hot water, it's recommended that you obtain a water report for that heated water so that the reduced alkalinity is used in your acidification calculation.

It's not the temperature, it's the change in alkalinity that produced the original recommendation!