Citric acid would be my guess. No more expensive then vinegar though. Just use lemon juice if you are concerned with ph and want to use something organic.lol organic pH down. Was it just a big jug of cider vinegar?
Anything that changes the pH has the potential to kill some bacteria that live at the edge of a pH spectrum.
I'd omit the fish emulsion. I used Alaska Fish Fertilizer (emulsion) until being informed of it being derived from a heat process which destroys many of the microbes. That particular emulsion product has also lost its former OMRI designation due to heavy metals content and is no longer approved for organic production.Bought the organic ph down. Only to use it when I cut clones and have to ph water. Been using tap water that I let sit out for a day. Plants seem to be happy ph of the water is 7.9 so I'm guessing the microherd is doing it's job. My plants never looked unhealthy I just was wondering if I could make them grow more optimal. I'm actually satisfied now with the growth organic teas been working great. Fed them a veg tea it had 1 cup ewc, 1 tsp fish emulsions, 1 tsp mollasses and one tsp fox farms fruit and flower. I let bubble for a day and a half mixed it 50/50 with dechlorinated water. Plants are thriving next time I'll add guano to that tea. Got the ingredients for this tea in the newest skunk mag.
There's no need to ph any of your water. The only place to worry about your ph is in your soil mix. Make sure you have that buffering zone with the dolomite lime or whatever you use and the microherd will do the rest.not try to jump on your post but you tell me i dont have to ph my water when make a tea brew bro