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Message: <blockquote data-quote="MarsReefer" data-source="post: 10319164" data-attributes="member: 191974">Well I spent the last few days researching and building an outside air intake for my overflow, adaptable to handle my skimmer when I get one. It looks like a resounding success at this point. After my fresh air window test I went to home depot and get a bunch of fittings and used 3/4" PEX to run a line outside then reduced it to a 1/2" OD- 3/8" ID tubing connected to my durso overflow. [ATTACH=full]2713809[/ATTACH]I control the air intake with a simple valve. It has the added bonus of completely silencing the overflow so that the only noise is now coming from the sump.I added an additional indoor intake valve so I can swap to indoor air if needed for any reason.[ATTACH=full]2713811[/ATTACH]Ran it just above the basement window, just need to silicone the hole shut to wrap things up. The outlet of the tube is on a covered overhang behind some bushes so it is protected from wind and rain, and can't be seen from outside. I did shove some filter floss in the end to keep bugs out. I don't spray any herbicides, and only limited pesticides, nowhere near that area so I shouldn't have any contamination issues.[ATTACH=full]2713812[/ATTACH]And the results, overall an increase of 0.2 over 48 hours, and it is still trending up so it may stabilize higher. Much better than the 7.5-7.6 I was averaging before.[ATTACH=full]2713816[/ATTACH]</blockquote>