Thanks for the quick response, I will get the alkalinity and ph numbers and post them. This is the first time I will be using this filter. Probably a good idea to know the alkalinity anyway, right? It is a RO and DI setup with a carbon filter.Conflating RO and DI as if they are one and the same might get you in trouble. High quality RO can approach (but never quite reach) true DI, but run of the mill RO typically exhibits a touch of alkalinity, and poor RO may have alkalinity at levels that should be addressed.
That said, I agree with @Vale71 that RO water can generally be used as is for sparging, with no acid treatment. But I also agree with @RPIScotty in that it depends upon the alkalinity.
In a perfect world, your RO water will have low to no alkalinity. I actually asked about pH and alkalinity because I misread your post and didnt realize you were referencing RO/Distilled.Thanks for the quick response, I will get the alkalinity and ph numbers and post them. This is the first time I will be using this filter. Probably a good idea to know the alkalinity anyway, right? It is a RO and DI setup with a carbon filter.
Only one way to find out. Add some lactic acid to a gallon of water and see. This is what a lab would do (except they'd use sulfuric acid) if you sent a sample off to them for analysis. So put a gallon of water into a bucket and add a drop (0.05 ml) of lactic acid to see where the pH goes. It should take precious little acid to get you to 5.5. A drop of 88% lactic acid is about 12.5 N at pH 5.5 so a drop would provide about 0.625 mEq. It takes 0.03 mEq to lower the pH of a liter of DI water to 5.5 or roughly 0.12 mL/gal so if a drop took a gallon to 5.5 you would know that the alkalinity of the water was about .125 mEq/L (6 ppm as CaCO3). But you really don't care what the alkalinity is (except diagnostically). All you want to know is how much acid to add to get to pH 5.5. It should be around a drop per gallon - less if your RO unit has lowered the alkalinity level below .125 or so and more if it hasn't.I want to adjust my sparge water ph to 5.5
I am using RODI water no salt additions till boil. How much 88% lactic acid per gallon would I need?
That is just a smidge less than 9 ppm alkalinity, at 8.924.Checked my Alkalinity with a hanna checker. It came out to be .5 dkH. This means the RODI setup is doing a good job right?
Do you still believe one drop per gallon would be a good starting point?