hindsight is always 20/20
on a good note ive been crunching some numbers
for meto buy prime by the 4 liter it costs me 69$. it would treat 40,000 gallons. the cost to dechlorinate one gallon of water is $0.001725
for me to buy a chlorine filter costs 11$ plus 12dollars for housing. but the housings reuseabe.
One filter costs 11$ and treats 20,000gallons. the cost to dechlorinate one gallon of water is $.00055. I would also like to note i wouldnt have to mess with the prime everytime i want to do water change or topoff.
The chlorne filter can filter chlorine out at 1 Gpm kinda slow for my taste. but hey less work for me.