View Full Version : phosphoric acid
shamsoo
02-03-2003, 02:30 PM
after mixing r/o & tap water ph is 7.5, can I add phosphoric acid to bring it down to 6.8, what will happen after adding the acid?
thanks
Samsoo,
Yes you can, but watch the hardness.
shamsoo
02-04-2003, 04:48 AM
thanks Jeff I will monitor the hardness and keep an eye on it
roger
02-04-2003, 04:51 PM
It might work better if you go with pure RO, instead of mixing it with tap water. It wont take much acid to bring the pH down with just using RO. You will need to add something back to the water to put some minerals back in. RO Right or something like that.. This is assuming that you have moderaltely hard water to :)
If you can, post what your tap water parameters are like, that will help everyone when they try and work out advice for you.
Peace,
Roger
If mixing with pure RO it is possible for it to crash 1-3 days later so also keep an eye on the PH several days after adding acid. ;)
shamsoo
02-05-2003, 12:51 PM
thanks Jeff / Roger, tap water is TDS 220 ph8.2 gh 10 kh6
Phosphoric acid has phosphates. The most common problem with using it is an increase of algae.
Using acid with pure R/O water will raise the conductivity and reduce the buffering capacity--thereby it would crash quickly. I do not use any acid at all. if using something to regenerate the R/O--then the best thing to do is get a "recipe " so as to not need acid at all. The yoyo effect when using acid then buffers makes no sense to me and is self-defeating. Joe :(
Steve_Warner
02-07-2003, 01:35 AM
The yoyo effect when using acid then buffers makes no sense to me and is self-defeating. Joe :(
Hi all,
Hey Joe, well put! I TOTALLY agree.
Steve
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