the reason I'm asking , is cuz I'm outta moneys for this month and orange juice is all I got ... no vinegar , otherwise I woulda used that of course Soil PH is now over 8 , and plant growth SEEM to have slowed down a peg , not alot - but wouldn't want it to get worse
I know this thread is old but check out this link. Sounds like you can make a pretty easy Ph down for around $15 http://forum.grasscity.com/hydroponic-growing/730285-cheap-ph-down.html