You need to check with your water municipality about what they use. Most do not use chlorine anymore but chloramine. The latter of which can not be out gassed. I don't mean to knock a company but this is very basic tea info and if GS does not know this I would be suspicious. NTM is it pointless to use a hydrant hookup for a 300 or even 500 gal sprayer. Simply use 2 or more spigots and you will be full in less than 20 min. It will take longer than that to d!(k around with the hydrant hoses, hookups, water meter, billing, etc, etc... You also mentioned "expensive compost for high end customers" Do you realize how little compost you need for brewing? Compost should be about .5% of your brewing cost even if you are paying $5/lb (which is double what the best cost) Cutting corners here is the equivalent of picking up pennies off the street, do the math it's not worth it by a long shot.