What dechloranator is the most concentrated/value for money? I have just finished my two 5L containers, so it has been quite some time since i have had to buy any! But when doing water changes for my6 tanks, i dont want to be wasting money!
If you just want to get rid of chlorine, and aren't too bothered with the bit of ammonia left from chloramine, sodium thiosulfate crystals are by far the cheapest. I'm seeing 8 pounds for $20, a pound will dechlorinate from 30,000 to 150,000 gallons of water depending on the chlorine level of your water.

Pond dech. hmm. Sounds like a plan. Any suggestions what one to get?
If you just want to get rid of chlorine, and aren't too bothered with the bit of ammonia left from chloramine, sodium thiosulfate crystals are by far the cheapest. I'm seeing 8 pounds for $20, a pound will dechlorinate from 30,000 to 150,000 gallons of water depending on the chlorine level of your water.
I have some of this - but thought it was tricky to dissolve in big buckets of water.... can i devolve the set amount in a tub of water, then add that the the big container of water to have the same effect?