Hi to all,
I hope everyone is travelling well. (or not travelling and well)
I set up a RO water storage container for my room a while back. It is food grade plastic 200 litres. It is not sealed at this point and I have a pump that switches on every 6 hours for 15 minutes. The pump pumps the water out, through a UV filter then circulates back into the tank. The pressure also feeds a float valve in my res for my RDWC setup. As it was RO only i wanted a way to keep it sterilised while stored. I then manually fill that storage container about once a fortnight.
My issue is that i was not aware that CO2 can pass through a RO filter and then over time react with the free H+ ions and create an acid that lowers the PH. From what I have read it usually drops it to between 5 and 6. Not a huge amount. I am finding that my RO store PH is going down well into the low 4s. It takes a lot of PH up to correct it. It seems to take time though to drop all the way down. Maybe a week to go from about 6 down to 4.
Are there any other actions that could be causing this?
I also read that due to the lack of substance in the water that the H+ ions react with the carbon dioxide. I therefor tried to calmag my water while it was stored in the tank thinking that it would help but it does not seem to make any difference.
I would really like to understand what is happening here and hopefully figure out a way to stop it occurring.
I am fearing that this may be something that will prevent me being able to store water before use which is required for my system.
If anyone has any ideas then please feel free to chip in.