How do you gauge how much water you remove?

[Sake]

Just curious how ya'll gauge how much water you take out during a PWC. Me, I took a tape measure and marked off for 10, 25, 50, 60, 75, 80% on the side of my tank. I'm guessing most people just eyeball it?

 

[LyndaB]

I use a tape measure hung on the tank each time, and then figure in the displacement amount created by decor.

 

[Sake]

Good I'm not the only precise one!

 

[LyndaB]

If it weren't for the fact that I need a fairly precise measurement in order to dose my Prime correctly, I would just eyeball it.

 

[RDerrick]

I have a 3 gallon bucket and a 30 gallon tank. It took me a while to find the right bucket to do water changes. My soon to be setup 20 gallon has a 2 gallon bucket waiting.

 

[Coursair]

If it weren't for the fact that I need a fairly precise measurement in order to dose my Prime correctly, I would just eyeball it.

FYI you can dose Prime 5x the normal amount and still be safe. Prime is 2 drops per gallon.
Easy Peasy !!

 

[Kingzilla]

I use two identical 12L buckets with a mark up the side for each liter. I vacuum water out until I hit the number I want in each bucket then dump, rinse, and fill them each up with an extra liter of water, treat them, and pump them back into my aquarium until I hit the full line and the remaining little bit of water tops up my betta bowl

 

[Coursair]

I eyeball it. I use a 5g bucket between 4 tanks.
All 5-10g. Been doing tanks a long time. Less stress is good.

If I worry I just add a few more drops of Prime.

 

[mohican]

I guage mine off of heighth of tank. If tank is 18" tall, 50% would be 9". I just do some math to figure whatever water amount I want to remove. I just put a piece of tape on side to mark and remove it when I'm done.

 

[Sake]

FYI you can dose Prime 5x the normal amount and still be safe. Prime is 2 drops per gallon.
Easy Peasy !!

Hmm 2 drops per gallon, thanks, I'll have to remember that. Or when I forget PM the heck outta ya till you remind me! lol

 

[LyndaB]

FYI you can dose Prime 5x the normal amount and still be safe. Prime is 2 drops per gallon.
Easy Peasy !!

Yeah, I know. But why would I want to waste all that Prime when I don't need to?

 

[Coursair]

I buy a small dropper cap bottle of Prime and refill it as needed.

 

[Coursair]

Yeah, I know. But why would I want to waste all that Prime when I don't need to?

I don't waste Prime, I just don't stress if I add 3 extra drops.

 

[Scouser]

Yeah, I know. But why would I want to waste all that Prime when I don't need to?

Haha I know what you mean!

I used to just add a certain amount by eye but know I get out my syringe and draw the exact amount based on my percentage.

But being so concentrated I haven't even made a dent in the reserves