I've been dry dosing and decided after building the iAqua to try using pumps to auto dose. Honestly dry dosing is quite easy, just measure out the ferts into pill containers when I do a water change, then dump the one thing in each day when I feed. But now I don't have to ask my neighbor to do it for me when I travel.
I'm seeing on issue and am looking for ideas. Here is a picture of my setup.
As you can see the Macro (left) and Micro (center/yellow) liquid drain back into the container over time. Since they only get dosed every other day I end up with some empty tubing each day time. Now I was able to measure it and it is about 10mL of liquid. So I could just up the amount I dose to account for this, but that doesn't seem right.
I'm using silicone tubing and it is a single piece. This drain back doesn't happen with the Excel. I don't think it is because I dose every day. I've check it and it never drains back. No ferts drain between the pump and the tank. The pump prohibits that from happening.
Has anyone else had the issue where the pickup tubing drains? I've thought of a couple ideas to address this, but would like other ideas.
1. I could try a check valve, but I really don't like them especially if it is sitting is ferts. I'm not sure if they would last.
2. I could raise the fert bottle to be above the pump, I think that would ensure that it doesn't drain back into the pump.
3. increase the dosing amount to account for the drainage.
Any other ideas?
EDIT: I just remeasured the drained back liquid and it is 10mL, not 5 as I specified previously. I dose 50mL macros and 20mL of micros, so this is a significant amount.