Sulphuric acid. For 8$ you can make 4gallons of ph down. It is stable and works great in straight hydro too.
redrum after you mix w/ water you use accordind to your needs.
greenmatter its super easy to use and not caustic after its mixed. 14$ for 4 gallons of mix is as cheap as it gets. If you are doing coco or soil the ej one will work but not as good in water culture.
will the ph up and ph down from lowes work .this is used for outdoor water pond.it claims to be safe for vegatation. Taproot
will the ph up and ph down from lowes work .this is used for outdoor water pond.it claims to be safe for vegatation. Taproot