Dosing Container Help

[reidcrandall]

I'm getting a dosing pump, and maybe I'm way over thinking this, but I don't want to have an open container for my mag, Ca and alk solutions, because evaporation would change the concentration of the solutions over time. But if I have a closed container, the peristaltic pump would create a vacuum over time and crush the container. But I can't seem to fine any sort of information on a suitable air intake valve to add to the container that will allow air in when the pump is one, but close when the pump is off to stop evaporation. Anyone have any ideas?

 

[MaLi]

Reid, I use 1 gallon jugs like the one used for vinegar at Kroger or Walmart. It's calibrated, more vertically developed (lower floor space required) and ... free (if you use vinegar to clean your pumps). To avoid vacuum crashes you will drill a small 1/16" hole in the led. No problem with evaporation at all.

cheers,
Marian

 

[jcolletteiii]

I just make the hole in the lid very slightly larger than the hard tubing that goes through it. Never a problem with vacuum.

 

[Cozmo4]

As MaLi explained, I drill a small additional hole in the top as well. A couple of pics...

<a href="http://www.flickr.com/photos/46634369@N05/5743037255/" title="DSC_0001 by Cozmo420, on Flickr"><img src="http://farm4.static.flickr.com/3308/5743037255_15e6fc127a_b.jpg" width="1024" height="681" alt="DSC_0001"></a>

<a href="http://www.flickr.com/photos/46634369@N05/5743037489/" title="DSC_0002 by Cozmo420, on Flickr"><img src="http://farm6.static.flickr.com/5222/5743037489_ac95321292_b.jpg" width="1024" height="681" alt="DSC_0002"></a>

 

[scottv1025]

Thats the way i did mine too . Works good