Reddit reviews Ammonium Sulfite Monohydrate, 97.3%, Certified, 500g
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Packaged in 500g clear plastic bottle
I’ve only ever done it on a laboratory scale, so if you’re using a reasonably large tank, I don’t know how well it will work.
You need a gas canister of nitrogen or argon. You can buy one at a local gas supply store like praxair. You might also find one online. Run some hosing from the gas canister to the bottom of your tank and open a steady bubble for 30min or so.
Wikipedia says that ammonium sulfite will consume oxygen from water. I’ve never tried this, but if you don’t mind introducing salts into your water, this may be simpler.
https://www.amazon.com/Ammonium-Sulfite-Monohydrate-97-3-Certified/dp/B00LZ63D16