You see the problem is Biobizz nutes have a pH of 4 (I probed it before) and because they're organics they take a few days to break down.
If you feed with them daily or every second day they build up in the soil and act as a buffer. Obviously the soil won't get anywhere close to pH4, but it drops it below 6 (tested runoff after a plain water watering when I was using Biobizz and got 5.7).
My solution was to ditch Biobizz,it's just completly CRAP compared to other ferts tbh.
Hope this helps!
Your runoff can go all the way down to 5.5 for all i care, this is just a measure of the salts in the soil not the actual soil itself, pH is really misunderstood, dont mistake it for salt build up like you are describing. If the runoff has a low pH then also read the ppm of it, should the ppm be a little high like 1600 then yes definatly salt buildup
Now to say Biobizz is crap is basically a sin to most biobizz growers. In organics wait over a week to see the full impact of the last feed hence why the biobizz company and i think chart is structured so you feed once a week. Less is definatly more with biobizz too. Dosent matter what pH the pure undiluted biobizz is, arent most ferts highly acidic when neat, read the ingredients its pretty concentrated stuff in most ferts.
Now basically a few simple questions
- Why are you worrying about pH in organics? I dont ph my water or ferts no more and never had one single pH problem, in fact i think the microherd appreciate me not throwing chemical acids and alkalis at them and anyways these little guys buffer the soil back up to pH7 cause thats what they like to do.
- If you are thinking the Biobizz is crap i am thinking somthing else is wrong to make you think that, i also struggled to get use to Biobizz but imo it is by far one of the best, lacks calcium though and extra mag supplements will be needed now and again but that said cal/mag is a cheap buy.
Maybe we should turn this thread into a small pH discussion and maybe touch on ferts as well if your plants are ok now. Anyway the main thing is your plants are ok and doing good and you worked out the problem, i like to hug my plants when there doing well and give them a slap when there playing up. Peace