So, no nutrient lock out noted as of yet to your knowedge?I recently learned the hard way that the Pool Shock formula is no good for your plants as they get older. Pool Shock is Calcium Hypochlorite - basically chlorine attached to a calcium molecule. The extra calcium added to your nutrient solution can cause magnesium to be locked out (magnesium deficiency).
A better alternative is to use Sodium Hypochlorite, or Clorox Bleach. No extra calcium, no magnesium lockout, no deficiency. The rate is 6-8 drops per gallon. A lot of people including myself have tested and confirmed no problems at this rate for killing and preventing Pythium.
@curious2garden, prolly has the answers you're looking for.Who's using, or has used Calcium Hypochlorite (pool shock) in hydroponics? I have a question or two.
I do flood and drain with rockwool hydro and I've been using pool shock for 2 years. Happy to help if you want to ask anything.Who's using, or has used Calcium Hypochlorite (pool shock) in hydroponics? I have a question or two.
Thank you both.I do flood and drain with rockwool hydro and I've been using pool shock for 2 years. Happy to help if you want to ask anything.
The pool test strips are ideal for getting your measurements, after about 50, I started eye balling it.Thank you both.
I'm still reading through a couple thread, but looking for the math for how to calculate how much to use to get "x" elemental ppms of chlorine. There are a couple different strengths (and brands) of "pool shock". The one I got (Azur Ultra Shock 70%) says "70% calcium hypochlorite". This one https://www.azurpool.ca/en/pool-sanitizer/ (scroll down, second product from the bottom).
If I could add this to HydroBuddy as an item, that'd be sweet, hah.
I'm in canada. I already bought that Azure Ultra Shock 70%. Maybe someone can show me the calculations.I used to do .01 grams per gallon and it worked fine after getting a magnetic stirrer. It helps breaking it down before adding it in my experience. Now I just eyeball it with a teaspoon and I don't think its had any negative effects.
If you are in the US, hth pool shock is my go to. I got almost a full two years from one of these. Idk if it ships out of the country https://www.amazon.com/HTH-Swimming-Chlorinator-Chlorine-Formula/dp/B09R841BDQ/ref=mp_s_a_1_3_pp?crid=3P3VOLWMF5P5S&dib=eyJ2IjoiMSJ9.aYcRnUshTDglmDpu15yumOVqSvvBDte-g_qTrbvW1t0n-SpsIHxCusTTzIv4lNbLhppVdTDaLnwzrnTzpIf70Q.3W1QjtKlMttyBBG1olQsR6WjPraNDM_bz38LbmNS_QQ&dib_tag=se&keywords=hth+pool+shock&qid=1704928680&sprefix=hth,aps,116&sr=8-3
If you get the right test strips, you can start at .01 grams per gallon and adjust accordingly. It's proportional, so it wouldn't take much water or pool shock to figure out the right numbers.I'm in canada. I already bought that Azure Ultra Shock 70%. Maybe someone can show me the calculations.
Thanks.
Ok. Thanks for your help.If you get the right test strips, you can start at .01 grams per gallon and adjust accordingly. It's proportional, so it wouldn't take much water or pool shock to figure out the right numbers.
I'd just use this:I'm in canada. I already bought that Azure Ultra Shock 70%. Maybe someone can show me the calculations.
Thanks.
I did find a couple of those after looking up "pool shock calculator" and finding what I thought is the right thing. Thanks for that link, that's actually one of the ones I came across. It only goes down to 100 gallon I think. I divided after, I think it made sense. But I was wanting to know the math and "logic" of it. I think that part *might* be coming back to me, it's foggy. I was briefly looking at the molecular weight, and I think I'll try and work it out some time over the next day or three.I'd just use this:
https://poolchemicalcalculator.com/Pool-Free-Chlorine-Calculator.html check Cal Hypo and choose 70%
If you'd like information on dilution calculations:
11.4: Dilutions and Concentrations
Calculate the new concentration or volume for a dilution or concentration of a solution.chem.libretexts.org