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Message: <blockquote data-quote="lexinverts" data-source="post: 6860816" data-attributes="member: 49463">Yes, I would recommend this device with a few caveats. First, I have only been running it for about a week and a half, so I don't know about longer term reliability. It has been working great for me since I set it up. It has done everything it is supposed to do, and has been very precise, with repeated tests always reporting the same KH value within .1 dKH. However, it is not simple to set up. I spent about three hours setting it up, which makes it significantly more work to get going than the Alkatronic, KH Guardian, or the Trident, at least according to what I have read. Part of the complexity of the device is because it can be configured in a number of ways, controlled by either a doser or a P4 controller, and can be purchased separately from the required dosing pumps. I had an existing GHL doser 2.1 that I repurposed for the KHD, so I had to cut my dosing tubes to the correct lengths, estimate volumes, etc... The Alkatronic and the KH Guardian (not sure about the Trident) come with pre-integrated dosing pumps, which makes them more "plug and play."I use ATI Essentials Pro with a GHL doser, but according to the GHL information you can control a calcium reactor with the KHD and the Profilux 4. See the quoted information below: "Calcium reactor control modeIn this mode, a calcium reactor can be down-regulated depending on the KH value.A calcium reactor is usually operated by CO2 addition and control of the pH value; the actual pH value in the calcium reactor is measured by a pH electrode. If you select this pH electrode in the KH Director Options, the KHD can switch off CO2 if necessary (KH target value reached), otherwise the normal CO2 control is activated. This mode is only possible with a ProfiLux aquarium computer."</blockquote>

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