Simple DIY Drop Checker (V2 is Alive! 3/31) - Page 4 - The Planted Tank Forum
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post #46 of 54 (permalink) Old 04-09-2011, 09:48 PM Thread Starter
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Quote:
Originally Posted by larams67 View Post
The part I'm not sure about is the diameter of the section that connects the surface area chambers. It would seem to restrict the exchange of gases.

I don't see how the chinese made glass styles for instance would be any good. A big funnel reducing down to a pinhole at the bend before opening back up for the ph solution chamber can't be effective.
I'm not positive about this, but I think that air will exchange gases very easily that it's not a problem. Meaning whatever level of CO2 is in the bottom chamber will quickly equalize with the rest of the trapped air, despite the small opening. Like I said, I'm not positive, but I thought I remember something like that from a science class along time ago.
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post #47 of 54 (permalink) Old 04-10-2011, 12:38 AM
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If you want the best configuration I have found, here it is: http://www.plantedtank.net/forums/sw...-checkers.html There is a DIY thread about how to make it too.

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post #48 of 54 (permalink) Old 04-11-2011, 07:29 AM
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The Chinese glass one works great for me. It changes about 4X faster than a DIY one I made..small amount of liquid, and volume, and a decent surface area-comparably. The small diameter at the top doesn't have an effect on the equilibrium speed. It's all about surface areas to liquid volume in the checker.

-Bill



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post #49 of 54 (permalink) Old 04-13-2011, 02:03 AM
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I'm going to be starting on this tomorrow as was wondering if you could use an old plastic medicine bottle.
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post #50 of 54 (permalink) Old 04-13-2011, 04:32 AM Thread Starter
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I'm going to be starting on this tomorrow as was wondering if you could use an old plastic medicine bottle.
I don't really know for sure, but I would think it would be fine. I wouldn't think it could be harmful to anything if it's used to hold medicine. Just make sure there's no medicine left in there.
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post #51 of 54 (permalink) Old 03-26-2012, 05:02 AM
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bump for a very useful thread.

I had a brand new airbrush bottle laying around and a few feet of 1 inch OD vinyl tubing. worked great. Just need some solution now.
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post #52 of 54 (permalink) Old 03-26-2012, 08:43 PM
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I like the fluval drop check. It seems to have a fairly low internal volume with a large water contact area:

http://ca-en.hagen.com/Aquatic/Water...plements/A7551

It also comes with an all-in-one indicator solution for lazy people like me.

My 40 gallon breeder (and 20 gallon long): http://www.youtube.com/watch?v=4ta07C0y0nk
My 10 gallon with PAR30 LED: http://www.youtube.com/watch?v=8rbms5asKmA
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post #53 of 54 (permalink) Old 12-01-2012, 06:54 AM
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i will definitely give it a try thanks for the idea
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post #54 of 54 (permalink) Old 03-25-2015, 08:51 PM
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Hotel travel shampoo bottle

Awesomely simple idea to build a drop checker. I am a big DIY fan and I am going to give this a shot. It suddenly occurred to me that the hotels keep these small travel size shampoo and mouthwash bottles which seem to be in the perfect size range so I took home one of those from my official trips.

Click image for larger version

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They are however plastic and I was wondering if this will effect the test solution or the test itself. I feel it should not since you are using plastic tubing anyway. Any thoughts?

Cheers,
Hari
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