RO H20 + Cal Mag Plus = Unstable pH

[fulltilt]

Hello farmers

having some pH problems. Here's the setup...

20 gallon tote with 6 airstones for a bubbling DWC for seedlings.

Inside the 20 gallon tote there is currently 15 gallons RO H20 w/ 75 mL of Cal Mag Plus (5 mL per gallon Cal Mag Plus). There is nothing else in this reservoir.

Air temps are around 68 degrees farenheit and water temps are between 63 - 68 degrees farenheit.

pH is constantly rising. It needs to be adjusted every 4 hours. This is only a problem when I sleep. If I set it at 5.5 before bed, the next morning it will be in the high 6's.

The mix of only RO H20 and Cal Mag Plus has had 3 days to stabilize in the reservoir although the pH is still steadily rising.

Keep in mind that there is nothing being grown yet, this is a dry run to work any kinks out.

I am racking my brain trying to find a way to stabilize the pH. Please contribute some thoughts to this issue.

Thank You

fulltilt Reviewed by fulltilt on 12-03-2009. RO H20 + Cal Mag Plus = Unstable pH Hello farmers having some pH problems. Here's the setup... 20 gallon tote with 6 airstones for a bubbling DWC for seedlings. Inside the 20 gallon tote there is currently 15 gallons RO H20 w/ 75 mL of Cal Mag Plus (5 mL per gallon Cal Mag Plus). There is nothing else in this reservoir. Air temps are around 68 degrees farenheit and water temps are between 63 - 68 degrees farenheit. Rating: 5