DBannedanswered grow question 4 years ago Hi,
I dont use apple cider vinegar but i use plain white Vinegar.
And yes you can use the cider vinegar for ph down.
Try adding A few drops to your water with nutrients(shake well) then do ph test until you get ratio you want.
I use 1.5 to 2ml of white vinegar per 8 litres of rain water and a bit more for tap water.
Happy grow🌱🌱🌱!!!