Ph dropping ridiculously low?

Star Dog

Star Dog

Well-Known Member
For as back as I can remember I've rarely needed ph up, I'm on a 2nd bottle of pH down and still have 3/4 of my 1st bottle of pH up.
With my last crop I noticed the ph was dropping just sitting in the reservoir, it's stable up until its nearly empty say 4/8 litres left then it drops like a stone.

I measured the last of it today (5tlr) and was 4.4 yesterday it was 5.9 and through the duration of the week 6.1/6.2?

It's not a problem because I know it's happening it's the why it's happening I'm curious about, ph rising is all I've ever seen and read about for the most part.
 
70's natureboy said:
Sounds normal. That last bit left over in the rez can get pretty concentrated. You should refill sooner or lower EC some.
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Good idea, I use ionic for vegging and its easy enough to do as you suggested, but I use canna for flowering and I don't want to mix ab into other mixed ab nutrient incase of issues, your meant to mix A 1st blah blah and i know zero about chemistry so I don't want to risk it.
 
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Star Dog said:
Good idea, I use ionic for vegging and its easy enough to do as you suggested, but I use canna for flowering and I don't want to mix ab into other mixed ab nutrient incase of issues, your meant to mix A 1st blah blah and know zero about chemistry so I don't want to risk it.
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Find a one part mix, that way res stays clean, Cyco commercial is pretty good. Expensive but good.
 
I made this up to work out how much is getting used and to work out the run off, I can re ph and feed from that for now.
I might get away putting the last into a bucket then adding it back to new mix, normally my ph is 6.2 without any alterations, I'll try it and see.

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1 part do work out very expensive compared to a+b, to hit 1.2ec with ionic I need 6/7 ml per litre with canna it's 1.2ml, that's a huge difference!
I don't why it is 1 part is so expensive?
 
Star Dog said:
Good idea, I use ionic for vegging and its easy enough to do as you suggested, but I use canna for flowering and I don't want to mix ab into other mixed ab nutrient incase of issues, your meant to mix A 1st blah blah and i know zero about chemistry so I don't want to risk it.
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You can mix the A B separately in a Home Depot Pail or something and top up the res from that pail. .
 
Star Dog said:
It is worth it lol, my clone tent isn't automatic so I've got to feed them daily, I go through phases of can't be bothered then I have some enthusiastic periods when loads of stuff gets done and enjoy them, I'm currently in a enthusiastic phase lol
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I use at 40% recomended dose, then add other things from there.
 
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