We have a brackish water tank, which is low salinity. It's 1.005 specific gravity, which is 6.6 parts per thousand (PPT), which is roughly 1 TBSP/gallon of water, sea salt. I've been advised before to just dump it on my compost pile, and not water directly with it. However the tank has been upgraded to a 240 gallon, and with a 50% water change I don't really want to waste away that 120 gallons of water.
Is this salinity too high to water the garden/lawn with? What if I dilute further. I have a 330 gallon tote, so if I put 120 gallons of brackish water, and top off with another 200 gallons of rainwater, it would be about 1/3 of the salinity above, so then 2.2 PPT, which is 1.002 SG. That seems pretty fresh to me.
Backyard Gardener Houston, TX