I do eventually want to run the HOCL continuously in both reservoirs. I’ll probably just buy the good ORP pen but of course I entertain other options. People seem to have difficulty with making ORP measurements in reviews of both expensive and cheapo type units. It’s probably like pH pens - it’s a sensitive measurement system and needs to be properly maintained to function properly, and there is an intrinsic time constant to the measurement sensor that folks seem consistently impatient about.
I just pulled the trigger on an Oakton ORPTestr 10 for $20 shipped on eBay. It was listed as NIB, gamble maybe but we’ll see. Even if it doesn’t work, I’d get $20 of enjoyment tearing it totally apart. I’ll also acquire some calibration solution. If it works that’d be a nice professional-level tool, if not, I’ll almost certainly wind up with the Apera 
Thanks, much happier with this round of cuts. Hopefully not TOO big 
General update today. I took apart my veg flood/drain (just gonna call this FD) setup and soapy-water washed it. Purged the pump with ISO and a rinse. Cleaned up really nice, and worked out to be pretty easy to accomplish in conjunction with a bussing bin (thanks @Dirt_Wizard I picked one up locally and use it all the time) to stow the plants in.
Here’s what the res looked like before I removed it to clean.
I did something, maybe bad, I think it was a good decision (or I wouldn’t have done it). I mixed up 200ppm HOCL solution with RO. I dunked/soaked for a few minutes each cube individually as I was mixing up the fresh nutes for the reservoir. Rinsed them off with RO and back onto the clean FD setup. The logic here was two-fold, make sure I’m not accumulating salts, and handle any nasties/quell the algae. I figured I have all the plants in a bussing bin already, why not. Overkill perhaps. But I’ve seen people post problems with salty blocks I’d rather just avoid the problem rather than wait for it to manifest.
Some of the Runtz x Sour Bubble cuts still aren’t showing roots - they are a little more stubborn I guess. We’re sitting at 12 days on all the cuts, everything else I check is pretty much ready for transplant. But I’ve got most that are cranking roots I need to get hardened up and transplanted out. So vents are open now and light PPFD is up to 130 or so. It’d be really nice to have two of these setups so I could leave the Runtz x Sour Bubble slow-rooters in humid/dim setup while I harden off the others in a different environment.
Plan: Prepare the 4" cubes soaking in 5.5pH nute solution tomorrow morning. Remove dome from clone box for hardening, I’ll try to shield the still-rooting cuts with an improvised partial humidity dome. Sunday morning I’ll migrate the “hardened” clones to the cubes and put it in the flower chamber starting around 150-200 PPFD. Over the course of a week I’ll get to desired, much higher intensity as the roots take hold. Is that a reasonable plan? If it’s fatally flawed please let me know.
