8/23/2023 0 Comments Siphon overflow box![]() It siphons water from your tank to a lower-level outside of your tank so it can be drained. ![]() The HOB overflow requires a siphon to work. They are solidly made, use a siphon channel instead of tube (making it nearly possible to clog), and most come pre-packaged with a sump to restart your siphon.Įdit: Lifereef is a better design. I would suggest the CPR CS series HOB Overflows. This way if the power fails or your water level drops too low, you don't lost your siphon! The pump will restart it when the power comes back on or the water level rises. The single most important feature your HOB overflow can have is a pump connection on the siphon tube/channel This allows you to connect a diaphragm pump to start or restart the siphon automatically. If you buy cheap - it will never be reliable. You can make your HOB overflow 100% fail-safe: However, If you are forced to go the HOB route keep reading - you aren't doomed to a flood. I wish someone had a guide like this when I started out. I converted a FW tank to SW and already had it packed with SPS when I wanted to add a sump. If you are reading this and don't have a tank set up yet - BUY A REEF READY TANK WHILE YOU CAN! For me, it was too late. For this, I could have easily bought a new reef-ready tank with internal overflows pre-drilled. Getting the most reliable overflow you possibly can is not going to be cheap - the entire setup for my 20g cost $150. HOB Overflows have a reputation of being ticking time bombs - don't let yours explode! Because of this, I decided to put together a guide on exactly what you will need to make the most reliable HOB overflow possible (which ends up being less prone to flood than most people's internal overflows!). I have read countless stories of overflowing tanks caused by these and had a close call this past week. I know a lot of people here who either converted their freshwater tank to a reef or simply added a sump to a previously sumpless tank were forced to use a HOB overflow. However, I want to reiterate I am not saying you should go out and get a HOB if there is ANY possible opportunity to do it the right way internally. These things can definitely be reliable with the right precautions, parts, and maintenance. Neither the float switch or GRI switch has been tripped in over a year (except for me testing them). But, I added a SECOND GRI Water Sensor on the tank to shut off the return pump if the tank is going to overflow. However, It's been over a year since I've put this HOB on my tank and about 2 months since I converted it to run on FULL SIPHON as a Herbie (with no backup drain). Disclaimer: If you have the option ( at all) of getting an internal overflow or a glass-holes style overflow - GO THAT ROUTE!!! It is a far better, far cheaper solution.
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