How much Hydrogen Peroxide do i need please

leon · #1 07-10-2023, 01:27 PM

How much Hydrogen Peroxide to use.

We have a large pond of some 50,000 liters of water.

We need to use 125ml of 3% Hydrogen Peroxide for every 380 liters of water.

However I could only get 15% Hydrogen Peroxide and have to come up with the amount of Hydrogen Peroxide
I would need to get to the recommended 3% dosage, for that 50,000 liters

I have come up with a figure that I thought may be correct but would like some others to check my calculation please.

Many Thanks

Leon

doppler (Rick) · #2 07-10-2023, 01:57 PM

3.289 litres

25mm per 380lt at 15percent concentration

50000/380=131.8 x 25ml = 3,289ml

Rick

leon · #3 08-10-2023, 06:12 AM

Thanks Rick, My calculation was a bit out I think I came up with about half of that

yours is pretty straight forward math.

Leon

Hans Tucker (Hans) · #4 08-10-2023, 06:48 AM

Decided to go Blonde Leon?

leon · #5 08-10-2023, 01:51 PM

No mate, I am pretty much blonde anyway if you can call all over grey blonde.

my avatar is totally out of date

Leon

OzEclipse (Joe Cali) · #6 08-10-2023, 11:05 PM

Leon,

I presume you're trying to remove some sort of organic material, eg algae from the pond water and hard surfaces?

The H2O2 reaction with organic matter is very sensitive to temperature.

Depending what the problem is, if you can wait until the pond water warms up, you'll get a much better result.

At 10C-15C it will go at a snails pace if that, above 20C preferably above 25C, it will work much much more quickly and effectively. Don't wait if an algal bloom may result.

Joe

leon · #7 09-10-2023, 06:11 AM

Thanks Joe, good advice, the pond is just a pond nothing special but it dose have algae happening and we just want to try and control that a bit, it doesn't have to be crystal clear like a swimming pool as such but just a pond with some lilies in it, I will get a photo of it today.

Leon

AstralTraveller (David) · #8 09-10-2023, 03:57 PM

Leon,

Hydrogen peroxide will attack organic matter including you. The 3% is pretty mild but I think 15% will bite. I've only ever mixed down from 30% and it certainly is dangerous - especially to eyes. I don't know what safety instructions the manufacturer suggests but I'd go for waterproof gloves and eye protection as a minimum. If you have a full face mask I'd use that too. Also long sleeves, long trousers and closed shoes. In the lab we also had an eye-wash station and emergency shower within a few steps, so perhaps have a hose ready in case you need to rinse it off something.

FWIW hydrogen peroxide decomposes over time, leaving just water. If you don't use it immediately store it in the dark in a cool place. In a fridge is best but not in a domestic fridge with food!

leon · #9 10-10-2023, 06:13 AM

Thank you for your advice well noted.

Leon

Constant (David) · #10 10-10-2023, 12:46 PM

Leon,

I've kept fish for many years, not in a pond but in aquaria. Typically my very ordinary goldfish will live a decade or more, longevity is a great indicator of health.
The key..... water circulation, circulate the water as much as possible, a big submersible pump can be had for next to nothing on ebay. Pump as much air as you can into the water.
To control the build up of nitrates, draw water from the bottom of the pond and give the nitrogen rich water to your plants, they'll love you for it.
If your keeping carp a solid water change every week, they're such grubby fish closed systems like ponds require active management.

Ps: my last goldfish died in June of this year, the age estimate 15 years. I'm not keeping goldfish anymore i was quite attached to the fish.

OzEclipse (Joe Cali) · #11 11-10-2023, 05:55 PM

Quote:

Originally Posted by Constant

Leon,

I've kept fish for many years, not in a pond but in aquaria. Typically my very ordinary goldfish will live a decade or more, longevity is a great indicator of health.
The key..... water circulation, circulate the water as much as possible, a big submersible pump can be had for next to nothing on ebay. Pump as much air as you can into the water.
To control the build up of nitrates, draw water from the bottom of the pond and give the nitrogen rich water to your plants, they'll love you for it.
If your keeping carp a solid water change every week, they're such grubby fish closed systems like ponds require active management.

Ps: my last goldfish died in June of this year, the age estimate 15 years. I'm not keeping goldfish anymore i was quite attached to the fish.

Good advice. The pump and the hydrogen peroxide are basically doing the same thing. Algae are anaerobic, they don't like oxygen. That's why they grow best in stagnant water. The pump oxygenates the water and the hydrogen peroxide is basically a water molecule with an excess oxygen molecule.

Joe