Aquaman95 said:
Thanks for clarifying that mas. I can promise you not diluting the acid beforehand will likely result in heater core destruction, I can appreciate your logic on the pre-dilution and it may prevent the problem. I'm just very nervous about it...I accidentally installed acid injection pre-heater several years ago in a very large pool with a complex plumbing system. After writing the check for a new heat exchanger on a 1.1 million btu boiler I can assure you I'll never make that mistake again!
Ouch, that's gotta hurt. I can understand your concern.
However, I am pretty confident that I will not run into the same problem since I have taken some precaution in making sure PH levels do not get too low. I measured the PH of the water coming out of the equipment with the acid injection system I described and it is above 7.5 which is no where low enough to damage anything. The key factor is injecting the solution at a slow enough rate to keep dilution ratios high.
Some peristaltic pumps will inject faster than others and probably well above the injection rate that I am doing. So these injection systems must cycle the pump on and off over time to achieve the desired PH. When the pump is on, this tends to make the PH much lower so more caution is required for the installation which is why they recommend post heater installation. The method I was describing has injection rates much lower therby causing only a small drop in PH but continuous.