Are you using a Cal Mag supplement with the Age Old? I used Age Old Grow/Bloom for my outdoor this year with General Organics Cal Mag and a few other organic supplements
I had a horrible muscle spasm in my back and I acquired some 2mg pillz I popped two of them in the morning and my back pain was all gone for most of the day
With a 25-30 gallon reservoir a filled with fresh water it would take about 25 drops to bring it down to around 6.5 and with the silica in the nutrient mix it would take 10 times as much to go from 6.7 to 6.5
I'm not a big fan before using it my organic nutrient mix would balance out to 6.45 and after adding it to the mix it would raise it up to 6.7 and I would have to use a shit ton of pH down to get it to the target pH 6.5
Easy Super Soil recipe 8 to 10 bags quality organic potting soil and a 12 pound bag Dr Earth Flower Girl... Mix well let soil microbes break down all the organic material for 6 weeks then fill your containers up and water with pH balanced water
Find a good organic soil with beneficial bacteria and fungi to support root growth... As far as feeding goes I used Age Old Organics Grow/Bloom as my base nutrients for outdoor with great results for supplements during veg I used General Organics Cal Mag with Age Old Grow during flowering I used...
It's suppose to buffer to 5.6 for hydroponic use it's part of the pH Perfect line when I used it I used Advanced Nutrients pH up to get it to 6.3 for soil use