A warning about Clorox!!!
I have been using chlorine to sanitize my cloner during rooting and have been having really good luck. Well the other day I noticed some slime starting to form. I had not been very vigilant about keeping the correct chlorine levels and I added an aquarium heater to keep the cloner at a more constant temperature. Anyway, I was out of my usual liquid pool chlorine, so I decide to use Clorox bleach since the active ingredient is the same, Sodium Hypochlorite, and I have read online (so it must be true) you can use bleach in place of the pool chlorine. I added the bleach and tested it with my pool test kit to get 0.5 ppm chlorine levels. Then I adjusted the PH to around 6.0 just like I normally do.
The next day I went out to check on my cuttings and the roots had all turned brown and most of the very small white roots were gone completely. I went online and searched for what is in the Clorox and discovered the other ingredients include some harmless things for adjusting the alkalinity, some salt .. but among the list of ingredients is Lye. Lye apparently breaks down grease and does all sorts of good things for cleaning, but I am guessing it is responsible for the bad response of my cuttings. The next day I flushed out / cleaned the cloner and refilled with fresh water. I ran to town and grabbed some HTH Shock and Swim pool shock. It is mainly Calcium hypochlorite. Again it has a host of other ingredients but I read online "I am such a sucker for the internet" that it is the same stuff in Clear Res and works wonders.
I made up a solution from a tea spoon of the stuff and a gallon of water. Then I added a teaspoon or two of that solution to my cloner until again I had the chlorine back at 0.5 ppm. PH adjustment yada yada.
It has been 4 days now and several of the cuttings have nice large white initials again. It is still a little early to tell, but it seems like the pool shock is going to work great, where the Clorox was destroying the cuttings. It could be coincidence, but my current thinking is that Clorox in the cloner = dead cuttings.
I have long "one batch of cuttings" been a proponent of chlorine for controlling nasties in the cloner. I was always under the assumption that Clorox could be used interchangeably with pool chlorine. I don't believe that to be true any longer. I don't know for a fact that pool chlorine has no lye in it but it was working for me in the past, where one application of Clorox turned the roots brown.
I just wanted to give a heads up if anyone else is going the chlorine route. My current action plan is to adjust the chlorine and PH every two to three days.
Dan