Good evening every one. So here is the deal, as everyone would know, the planted tank goes with alot of water changes... This means that you need alot of new water that needs to be dechlorinated. I bought a 500ml bottle of Tetra aqua safe for R348. Dosing is 5ml per 10L of water. So for my 350L system, I need to dose 175ml. This alone would bankrupt me within the first 6months. So I know if you let your water stand for atleast 24hrs, the water would be good to go. I also know that all dechlorinators are Sodium Thiosulphate or a solution thereof. My question os where would I be able to obtain Sodium Thiosulphate? What does everybody use?