May 2, 2014 ·Marineaquariumhobbyists whosetanksdidn’t come with a built-inoverflowor can’t be drilled to accommodate one (i.e., those made of tempered glass) sometimes choose to use a siphon-based hang-on-back (HOB)overflowto feed water from theaquariumto a sump.View allAt AquaCave, we offer some of the best selection and best prices onaquariumoverflowboxes and accessories for youmarine,reef, and freshwateraquarium. CPR Continuous Siphonaquariumoverflowboxes provide the most efficient means of getting water to an external filter without expensive modifications to thetank.Apr 16, 2026 ·Maintaining stable water levels is essential forsaltwatertanks, especially when evaporation and salinity shifts threaten coral health and aquatic life. Anoverflowor auto top-off (ATO) system helps automate water replacement, reduce manual work, and prevent overflows. This guide highlights five compatible options, explains how they protect yourtank, and compares installation ease and ...Anoverflowbox is a great way to keep the water level at a constant in yoursaltwateraquariumas well as increase the rate at which surface water, and the film and dust with it, is removed. CPR Aquatics are high quality, black acrylic and built in the USA. Install by using a bulkhead. Bulkhead size will determine your flow rate. Sizes Available Extra Small - up to 250 GPH Small - up to 500 ...Eachoverflowbox set has a different flow rate/GPH (Gallons Per Hour) meaning the maximum number of gallons of water that can flow through it in one hour. Use as manyoverflowbox sets that will put all yourtankgallons through your sump & back to thetanka minimum of 10 times per hour. This is called a "Turnover Rate".
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