Originally Posted by tanseattle
If you have Koi, koi farms use sodium thiosulfate. The price is $5.50 for 500g bottle that make 10 gal solution to treat 250,000 gal tap water.
I don't understand what my small koi pond (4000 gal) has to do with Koi farms most of which are multimillion gallon operations. They need to use the most concentrated stuff to save money (koi are already expensive enough
). Unless you are running an operation with thousands of gallons, I don't think you will save that much money in the long run. I'm with Geomancer. The money is worth the work I would save in the long run. But hey, it's your time and your money.