Charterhouse 3D Bio Stacker - Towers are designed to hold your biological media balls (maxspect/mantis/polylab etc). Increasing the flow around your biological media & helping to improve biological filtration, plus keeping your block neat, tidy and easily accessible.This product is one single Bio Stacker Tower *each bio stacker tower will hold 4 x bioballs (dependent on brand)Need more than one rack? Bio Stackers are completely modular, meaning Bio Stacker Towers can be stacked on top of each other, or clipped together side by side to make one big stacker.Stack them on top of each other for a rear chamber filter, or make a flat open bio stacker for a low depth sump, the options are endless. All Charterhouse 3D products are printed in-house using PETG plastic, meaning the product is completely aquarium-safe and UV resistant.
