I have been using Sodium Thiosulfate Crystals to make my own dechlor for yrs because when bought in bulk it seriously reduces the expense of doing water changes.Simply mix 4oz of the crystals into a 1 gallon jug dissolve or use 1/2 teaspoon per 4oz of water. Treatment is 1 drop per gallon of tank water.. I am selling in increments of 8oz for $5 + $5 shipping. 8oz is $10 shipped, 16oz is $15 shipped, etc. Paypal excepted. Shipped USPS Priority Flat Rate I know it is hard to "trust the new guy" but I do have perfect trader ratings at plantedtank.net and Arizona Aquatic Plant Enthusiasts I ship all orders on the same day to reduce trips to the post office.