Concentrated formula that’s great for larger tanks. One can use the pump bottle or just measure the correct amount direct from the refill. Has a distinct sulphur smell but that’s just a characteristic of a concentrated dechlorinator. Would definitely recommend.
Bought to refill the pump bottle (easiest way to dechlorinate water). A little stinky at first, but that goes away in an hour or so.
Excellent product treats thousands of gallons literally I will definitely buy it again!