Another option is to, again, cut out that section where the 90 degree drops into the sump. Replace the 90 degree with a 'T'. Have stem part of the 'T' drop down with a valve, and then the other part of the 'T' run a little further, then with a 90 degree, then valve into the second chamber. Or a valve right away out of the 'T' and a 90 into sump.
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