yea im shure that pure water has a ph of 7. theres only 3 things i can think of that would make the water so acidic
1, i didnt clean the barrel enough before useing it (i scrubed and rinced it) the barrel was previously used as a containor to bring fencing staples into the country
2, i live next to the blenheim airport and pollution might be too high
3, i havnt gotten up on the roof yet to see how clean the gutters are, thought they would be alrite as theres no tallish trees around the house and i dont have a ladder, in the bottom of the barrel theres minimal crud, just acouple of leaves, ammonia level of 0 though