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For aquariums with measurable nitrates
Poles are on the flat face sides
or stop and restart the pump
If using a media bag: Place the desired amount of carbon in the media bag and rinse until it runs clear
TL Reefs Magnetic Dosing Tube Holder Parts For aquariums with measurable nitratesThis holder will keep all your dosing tubes secured and out of the way. 1 4" bulkheads for firmly holding standard 1 4" OD tubing 4 x 1 4" tubes included Strong Neodymium magnets combined with a grippy oring hold securely in place on aquarium thicknesses up to 3 4" Magnets are completely encased in cell cast acrylic and will never get water in them. No worries about rusting magnets causing water quality issues.