DIY Automated Alkalinity Controller

by | Feb 13, 2016 | DIY, Equipment, Industry, Science | 1 comment

reefs.comKHGAt one point or another all reef keepers have dreamt of this device. A constant alkalinity controller that keeps carbonate hardness (KH) rock solid. David Cheng made this dream a reality by building his own “KHG”. “It took me two years to complete it and one year to test correct it.” 

The components were sourced from various suppliers and compiled into this 3D printed body. David lists some the KHG’s impressive capabilities:

  1. The recognition of this KHG is 0.1 dKH.
  2. Uninterrupted continuous testing error value approximately +/- 0.3dKH.
  3. Test range 5 – 12 dKH.
  4. Use single test solution,after the test can be discharged directly into the tank, completely without safety concerns about drug consumption required for each test 3-4cc.
  5. With RJ45 connectors, the distal support network monitoring and control, without having to install any software or APP, to operate directly in the browser.
  6. With SD card, long-term record test-related values.
  7. With KH automatic control,can be based on the current test value set by the user to maintain the KH value, the total water tank of solvent required to carry out the baking soda projections, since Automatically added.
  8. The test period can be automatically set from 30 to 240 minutes, each test takes about 3 minutes.
KHG data collection

KHG Data Collection Log. Credit: 曾柏源

Fifteen handmade units have been dispersed throughout Taiwan for testing as long as sixteen months ago. Beta testers are loving the unit so far leaving excellent reviews.


Credit: David Cheng

Onto the exciting news for the rest of us, “Commercialization is expected 2016 Q3” according to David. We’ll be sure to keep you updated as more information is released on this intriguing new product.

  • Austin Lefevre

    Austin Lefevre founded and owns Aqua Box, a group of passionate professionals who bring unique aquarium systems to fruition worldwide and offer fully quarantined and conditioned fishes to the US retail market. Austin has been a bonafide fish nerd for his entire life. When the kids in elementary school were reading Dr. Seuss, Austin was reading Jacques Cousteau. He's been in the aquarium industry since 2002 working in local fish stores, coral farms, and headed up a fish breeding program. He's been an avid SCUBA diver since the age of 12 and consistently seeks new aquatic adventures.

1 Comment

  1. Todd Buckman

    You’ve got too much time on your hands lol


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