Join Date: Jun 2014
Location: Cape Coral, Florida
PortalMasterRy - did you continue testing after stopping the UV?
I had real issues keeping iron up also (and incidentally had a in-filter UV going but wasn't thinking about it).
I finally did a bunch of calibration tests and found my reagent, despite being new, was simply bad. I also found some tests (Seachem in particular) take a VERY long time to register DPTA, much longer than they say for "chelated" iron as they only tested ETDA (they confirmed this on their forum). I'm finding I need about 4 hours to get a good reading not the 45 minutes it suggests.
With fresh reagent and careful testing I found I was substantially overdosing iron, brining it up to almost 2ppm instead of the 0.1ppm I was aiming for. It still gets consumed fairly quickly, but nowhere near as much as I thought.
Personally I'd suggest anyone testing carefully mix a known solution up for the target you are aiming for (all it takes is a few drops in a bucket) and test that before assuming your tests are good.
So I'm really curious how sure you are that it affected DTPA iron? I'm not saying it didn't, but this is the first time I've seen that, and I'm concerned as my UV's are on all the time.
Latest tank build:
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