DIY drop checker - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 03-23-2011, 10:57 PM Thread Starter
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DIY drop checker

Hello everybody.
My first post on this forum.

I have checked out many threads about DIY drop checkers and this is what I have came up with. Very simple and easy to make. All you need is 2 different size caps. One about 1in in diameter of the hair mousse and the other about 1/2in and one suction cup for the heater from Petco.

Now to the fabrication:

Cut big cap about Ĺ thru the length of the cap so it looks like this.

The fold fingers inside the cap, they will hold smaller cap.

Next insert smaller cap in attach suction cap and viola!

Add test solution, install in to aquarium


After about 2 hours the color changed to green, so it works.


Please comment. I'm open to suggestions for improvement.
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post #2 of 9 (permalink) Old 03-23-2011, 11:17 PM
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Delightfully simple! This has to be the simplest design I have seen, able to be made by anyone.

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post #3 of 9 (permalink) Old 03-23-2011, 11:56 PM
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I give you a 10 for recycling win!

I would want some sort of failsafe to keep the smaller cup from coming free and floating off as the plastic dome ages and (possibly) degrades a little from the constant immersion. Plastics can get brittle over time and I'd hate for it to dump the indicator in the tank.


Perhaps a dab of hot melt glue?
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post #4 of 9 (permalink) Old 03-24-2011, 12:16 AM
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wow, this is ingeniously simple

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post #5 of 9 (permalink) Old 03-24-2011, 01:10 AM
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Quote:
Originally Posted by redfishsc View Post
I give you a 10 for recycling win!

I would want some sort of failsafe to keep the smaller cup from coming free and floating off as the plastic dome ages and (possibly) degrades a little from the constant immersion. Plastics can get brittle over time and I'd hate for it to dump the indicator in the tank.


Perhaps a dab of hot melt glue?
Is bromothymol blue toxic?

"Simplicity is the ultimate sophistication." -- Steve Jobs

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post #6 of 9 (permalink) Old 03-24-2011, 01:13 AM
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Is bromothymol blue toxic?
It probably is if enough gets into the water, but I have no idea how much it would take. I know I have let some get in the water and saw no effect, but it was very small amounts.

Hoppy
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post #7 of 9 (permalink) Old 03-24-2011, 01:17 AM Thread Starter
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Quote:
Originally Posted by redfishsc View Post
I give you a 10 for recycling win!

I would want some sort of failsafe to keep the smaller cup from coming free and floating off as the plastic dome ages and (possibly) degrades a little from the constant immersion. Plastics can get brittle over time and I'd hate for it to dump the indicator in the tank.


Perhaps a dab of hot melt glue?
I had it setup for about six month and no problem so far.
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post #8 of 9 (permalink) Old 03-24-2011, 02:00 AM
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It probably is if enough gets into the water, but I have no idea how much it would take. I know I have let some get in the water and saw no effect, but it was very small amounts.
Okay, thanks Hoppy!

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post #9 of 9 (permalink) Old 03-24-2011, 03:53 AM
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I had it setup for about six month and no problem so far.
Good to know. I may copy this idea in the future build I'm doing lol.

I may get nerdy and make it from clear cast polyester resin, but only because I can.
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