so I am assuming your reactor is higher than your reservoir then. this is an awkward set up to do. I am also assuming now that you have a spicific drip rate set to match your evaporation.
The problem here is that "MOST" check valves that we use are spring loaded to alow them to be used in any position. If you buy one that is not spring loaded you will solve your problem of low pressure "BUT" if it is not orentated right or gets the slightest amount of contaminants in it it will fail to operate.
the easyest recomendation for me to make is to raise your reservoir and use gravity to feed your reactor. (this will also free up a pump for other uses) Now I can see this might not be a option for some people so let me think about this for a bit and I will see if I can figure something else out.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
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