Yup store bought is 3% and I added 10 ml of the stuff I have to 25 gallons and nope the girls were not at all happy lol. They lived but their bigger leaves curled up and died lol.
im not sure im understanding
I added 10mls of 35% to 25 gallons
. And yes they were not happy lol
is it possible there was something else going on that made them unhappy?I added 10mls of 35% to 25 gallons
chillers are great for healthy roots but it adds heat and takes power and there not cheap to purchase...and they break
I don't mean to be argumentative in anyway
Between my buried glycol loop and my mechanical chiller my water temps are a constant 65-66 and have not had any issues but if my temps get above 70 then all hell breaks loose for some reason 
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I hear and I struggled to justify the flooded root setup for that simple fact that I needed a chiller. Yes they are expensive but I have the capabilities to make them. Also for 3/4's if my season I use a passive chiller so two low wattage pumps. Again yup I thought long and hard lol. As for heat from the chiller, well if it's in the grow area then yes a huge waste as you now need to get rid of the heat from the water, from the room lol. I may still change the whole kit and caboodle and pretty much have everything including a couple of diaphragm injector pumps. My setup is in a remote building and infastructure is lacking with no running water except for garden hose and no dedicated drains.
I know your not being argumentative and it surprised me as well, I've used it for years as well, but yes it was the peroxide, I'm positive and confused as well. If I could still get hydroguard here, as you cannot add to much, it did drain the wallet though lol, I would use it but can't so now it's nothing except cold water and my root mat is now about 5" thick and a 2.5' x 4.5' mat so doing well. Oh and the cost of running the .5 hp, 6500 btu chiller is about $20 a month and that's with the highest rated electricity in NA lol.
if your able to set the reservoir on the bare concrete floor itll lower the temp a couple degrees maybe
Ya there are ways that you can try and maintain lower temps and I've tried em all. Even with my passive glycol chiller, once the outdoor temps went consistently above 65 it was not reliable. Honestly my recommendation if using a flooded root zone setup is chill the water. I resisted for a few years but figured if I was going to continue down the flood drain road I needed a chiller. Really the cost to run is cheap when talking a couple of pounds at the end of the run. My biggest issue with adding one to the lab was the purchase price which up here is $700 plus for a new unit, Said fuck that and built one lol.
Ya a bigger one may do it or a used water cooler and circ the water through the chiller res slowly may work and they're cheap as chips.
How so? Oversizing a chiller is probably the worst thing you can do for the chiller. Short cycling, energy waste, liquid slugging into compressor will all lead to premature failure of the equipment. The longer the cycle within reason & still have the ability to maintain the temps is best really.
maybe im wrong