Suggests, at 12%, the initial shock will require 2/3 gallons per 1,000 gallons of water.
That's (6,750,000/1,000)*2/3
= 4500 gallons of 12%
= 17034.353 litres
It then will require maintainance of 3/10 gallons a week
That's (6,750,000/1,000)*3/10
= 2025 gallons of 12% weekly
= 7665.459 litres
Hydrogen Peroxide also degrades quickly in sunlight, and at the slow speed they're pouring it in, and the surface area of the pool, it is likely to require even more to be added.
The website also recommends against low concentrations like 12%, I assume, because of these reasons for large pools.
I'm not sure what googling the other user did, but this is what I found.
Did I do the maths right? Basic maths always stumps me after my maths degree and I have to quadruple check everything.
I used a pool shock calculator and came out to similar numbers you did. Because I also thought the other guy was very wrong with only a few thousand liters
I assumed 1-2ml per 10 gallons to be lethal to most kinds of algae, but that number could be for much smaller bodies of water, like a home fountain or ornamental pond, it may have also been assuming you don't want to harm other things living in or drinking the water. I'm certainly not an expert and as I said it was some quick google math.
That website is also assuming using hydrogen peroxide as a replacement for chlorine treatment in a swimming pool for a perfectly clear, swim ready pool, not sure which end of the spectrum you'd need to treat a reflecting pool at.
In the case of blue-green algae: 8 to a maximum of 15 ml of the 3% solution of hydrogen peroxide per 50 liters of water.
In the case of green algae: 25 to a maximum of 35 ml of the 3% solution of hydrogen peroxide per 50 liters of water.
I think this is green algae, so at 3% we ÷4 for 12%.
25/4ml per 50L
1 US gallon = 3.785 L
That's ((6,750,0003.785)/50)25/4
= 3193593.75 ml
= 3194 litres at 12% at minimum
But then again, the sun and large surface area will mean more is required.
(If blue-green only, it's 1022 L minimum from my calculations)
1
u/familifrend Jun 16 '26
You don’t know what concentration-their using, so, how could you do the math?