What can I use as a line/marker for the water level?

[homersimpsonlikesfish]

What can I use as a line/marker for the aquarium saltwater level? Are there waterproof labels that I can stick on the glass? What works for you?

 

[Rmckoy]

I use a black sharpie marker and draw a small line at the water level on the corner of the return chamber of the sump

 

[Rmckoy]

Making rodi water to fill my ato as I’m writing this

 

[00W]

I use scotch tape on the front of my sump and keep the water level anywhere in that tape mark.

 

[homersimpsonlikesfish]

I use scotch tape on the front of my sump and keep the water level anywhere in that tape mark.

Thanks. I used a blue painter tape as my water level indicator.

 

[paulbtidges02]

Wet erase markers. Similar to dry erase but work well on glass.

 

[shakacuz]

most colored tape would do the job. i used white electrical tape for my sump then wrote over it with a sharpie.

 

[Gumbies R Us]

Here I am just eyeballing it haha

 

[The_Paradox]

Probably overkill but I cut out labels for each tanks prams and use the top edge as my water level indicator.

 

[fish farmer]

Yellow electrical tape. Then I write "Sump Level" on it for my house sitter.

 

[homer1475]

Black sharpie on the sump. No need to mark the display as that level should never change if the plumbing is setup correctly.

 

[Floyd-]

Little black marker on the glass works great for me.

 

[Joe31415]

Black sharpie on the sump. No need to mark the display as that level should never change if the plumbing is setup correctly.

Even if the plumbing is set up correctly (and no one touches the overflow valve), the DT height can still change if the return pump starts pumping more or less water.
Your DT level starting to fall is a good indication that it's time to pull your return pump out and clean it.

As for the sump level, there's a million ways to mark it, personally, I just use the ATO sensor. Any time I need to fix/reset the water height (or rather, the system volume), I bring the sump level right to the bottom of the ATO sensor.
The trick is not bumping the ATO sensor when you're doing maintenance on the return pump.

 

[exnisstech]

Another sharpie user here but now that I'm doing daily water changes I don't need the level marked. xx gallons out xx gallons in.

 

[SteveMM62Reef]

I have a Brother P-Touch Label Marker. Marked the high and low water levels on my Sumps. Also I got the little plastic key chain tags, take the ring off of them. Slide the clear window and cardboard out. Print a label for the electrical device. IE Pump, Filter, Heater, UV, Air Pump, using different colors for each type of device. Also on the back of the Tag, I label with the wattage and Amps. On the back of the cardboard tag, I write the date item was put into service.

 

[Nano_Man]

Yep sharpie pen mark on the side of my all in one tanks

 

[rhitee93]

This is what I did. However, I am pretty new at running a sump, so I'm still trying to decide what the level means