Generally in summer in low warm density water,,,, diffusers on stands do not mix water below the depth of the diffuser and water under the level of the diffuser does not get well circulated often not circulated. In winter the cold denser water and will tend to mix to the bottom under the diffuser on elevated stands.
Each 9" disk membrane diffuser needs around 13lbs of weight to keep it on the bottom. As the membrane 'clogs up' the membrane balloons up more thus a little more weight is needed.
IMO it is important for the diffuser to have a stable base that can be pulled or moved around by a rope if needed. You don't want the diffuser to have any chance of laying on it side nor have any more weight than necessary to hold the unit on the bottom. Extra weight is a disadvantage and IMO not necessary.
Plan on raising and scrub clean or power wash the diffuser each year for optimum performance.
Last edited by Bill Cody; 08/28/20 08:33 PM.
