What are you testing with?
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No flush needed with organic medium 
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Apera. The one that does like 4 different things I guess. I told the guy right now I’m just trying to learn ph. Lol got me for $140. It was worth it though. The thing is on point and haven’t had to calibrate it once.
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Just an FYI: probe needs to be stored in storage solution or 4.01 PH calibration solution. If you let the glass bulb dry out it will crack and no longer function.
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@Myfriendis410
Yeah I was told that if I’m using it weekly the moisture from the clean water I use between dips would be sufficient enough. If I take a break and don’t use it for a month or more is when I should use the storage solution……
Is that not correct?
@Autos-only
Apera gs4 or gs5
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No need to flush if organic…
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I would follow the instructions in the manual, it’s a tool and a pretty expensive investment and if it acts up could cost you even more plus replacing it. Not a risk I would take.
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There is no need to flush with organics like mentioned by some great growers, have you tested your water ppm you are using? Seems to me it’s hard water?
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@Autos-only
Yeah it says that in the manual as well.
@Autos-only
I use nestle pure life, reverse osmosis.
I haven’t done any research on hard water or testing for ppm.
I’m on my first grow and I will be researching a lot as now new quaestions and variables like ppm that have come up as I pushed through the first one.
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I would fill the cup with storage solution and when you’re done just put the cup back on the unit. I fill mine only when the liquid level gets low. I would not let it dry out at all.
They also indicate that use of distilled or R/O water for storage is a no-no. Has to be storage or 4.01 PH cal solution.
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Yeah I’m just following the manuals instructions so I don’t know. 