Redox levels

[niloc16]

my ph is 8.2 and the probe is brand new it just went in the sump last night.

[Psyire]

ORP Probes usually take up to a week to "settle in". I wouldn't worry too much and lower levels 280-350 are normal for a tank without ozone. (especially in the winter when indoor C02 levels are elevated)

[niloc16]

thanks psyire. the level has slowly increased over the past couple hours, but still nowhere near those levels. i'll wait a week and see how it goes

[Jaws]

Can anyone comment on how often you should replace your probes?

[Pescador]

They recommend 18 to 20 months for Pinpoints but you can use them until they can't be calibrated or read the right value. Even if the calibration is off, you can add or subtract the offset to your tank reading.