Let It Always Sow A Seed Of Memory

H.A.F.

a.k.a. Rusty Nails
Thanks for the input Joe. When i first got a pen bluelab and Apera were both put forward. Those bluelab pens are about $100 so I had to go with the apera at $55 but it will pay for itself eventually in the money I save. What do you use for calibration once you run out of their solution? I bought the 15 pack of the 4-6.86-9.18 for the pen i have but I think the apera calibrates at 4 and 7. It should be here tomorrow.
I use the Apera, and here's my take.

Great pen. If you are doing hydro then the 2-step calibration might be needed. I just use the first step (7.0 solution). My understanding is that the second one fine tunes it to the hundredth. IDGAF about that.

It's easy though. Before I feed I just check the ph of my calibration solution. If it doesn't read 7.0 I hit calibrate and let it do it's thing for a second. So I check it about once a week, but only adjust it about once a month or so.
 

spyralout

🌱🌿🌲🔥💨
My question is this - distilled water (or RO water) should be completely neutral (7.0) so is it usable as calibration solution? Is that in fact what I am buying in that little bottle? :unsure: 🤪
I have 2 RO systems. Both draw from the same city tap although on opposite sides of the house. One is 6 stage ("DI" at the last stage) and one is 5 stage (no "DI" stage).
Both produce 0 PPM water. One has a range of 6.4-6.9. The other has a range of 7.2-7.8. 🤔❔🤷‍♂️

That solution is probably buffered somehow to maintain steady ph unlike RO which has no buffer and can have wild swings. It takes very little ph up/down to make a noticeable change in RO.
 

H.A.F.

a.k.a. Rusty Nails
I have 2 RO systems. Both draw from the same city tap although on opposite sides of the house. One is 6 stage ("DI" at the last stage) and one is 5 stage (no "DI" stage).
Both produce 0 PPM water. One has a range of 6.4-6.9. The other has a range of 7.2-7.8. 🤔❔🤷‍♂️

That solution is probably buffered somehow to maintain steady ph unlike RO which has no buffer and can have wild swings. It takes very little ph up/down to make a noticeable change in RO.
I have a cheap 4-stage, and if I add 5ml/gal cal-mag my pH usually steadies in the right 6.5-ish range after a few hours aerating. I always add more stuff, so I always adjust pH anyway.
 

spyralout

🌱🌿🌲🔥💨
I have a cheap 4-stage, and if I add 5ml/gal cal-mag my pH usually steadies in the right 6.5-ish range after a few hours aerating. I always add more stuff, so I always adjust pH anyway.
Agreed. I add cal mag first too. Then the rest of the nutes. Silica every other res change or as needed. I like to cruise at 5.8 whenever possible but will let it drift to 6.4, ph back down to 5.5, and let it swing back up. If ph is dropping on its own then there is likely an issue, usually root related.
 

H.A.F.

a.k.a. Rusty Nails
Agreed. I add cal mag first too. Then the rest of the nutes. Silica every other res change or as needed. I like to cruise at 5.8 whenever possible but will let it drift to 6.4, ph back down to 5.5, and let it swing back up. If ph is dropping on its own then there is likely an issue, usually root related.
Mine is for soil, so easy as pie. I check it, adjust it, water the plants then forget it.
 

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