What I plan to use (every time I go out to do it, something comes up and I don't get around to it) is Sodium Metabisulfite, bought off Amazon. I researched the "advertised" preservatives, and this is all it is. I need to look up the concentration again, but I plan to use 4" pvc as holding chambers. It was on my to do list today; but planting apple trees took a lot longer then planned. Hopefully next weekend. I have cycled water through them post season to keep them wet.
2014 - 30 taps
2015 - 50 taps
2016 - 140 taps
2017 - 115 taps - 85 taps on 3/16, 30 buckets
2018 - 150 taps, all 3/16
Smokey Lake 2x3
Homemade 2x XLE-4040 RO Unit
Kubota L3940 - big sap hauler
Polaris Sportsman 570 SP - little sap hauler
I'm 1:20 remote from sugarbush, so I let run awhile between boils, and time is at a premium, so I try to oversize things