Brian, looking at the overflow you currently have, you could drill the back of your tank to line up with the bulkheads in the front of that overflow. You'd have to use some silicone on the bulkhead threads (inside the overflow) to get a good seal. Drilling through the bottom of an unknown tank can be risky since you don't know if it's tempered or not.
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Originally Posted by Etaloche
I did not know this, thought the overflow could just be anywhere. Could you explain to me why this is the case?
My reasoning for putting in the middle was that it'd be less likely that snails and whatnot would end up there rather than in a corner.
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Just visually. Since your tank is only 12" wide, an internal overflow will protrude a lot. I'd put it in a back corner. It won't make much, if any difference with the critters. I've never noticed that issue, nor actually thought about that before.
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Originally Posted by Etaloche
Alright I'll do this once it's hooked up. I think I will just get an inline one since they're not that expensive and the ease of use is a big appeal to me
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The thing about an inline TDS meter is that it only tests that one line. If you have a handheld one then you can test the tap water, you can disconnect the hose between the RO and the DI and check the RO performance and when it needs to be replaced, and you can check the product water after the DI as well. Also, the inline TDS meters can be tricky to get an accurate calibration on them since they need flowing calibration fluid. I find handheld TDS meters easier to use long-term. That's just my preferred method though.