Calculating lift is not simple and it has numerous variables. Volume of lift will also be affected by water depth, surface area of bubble production, and size of bubbles. Very few brands of diffusers have actually been volume tested.
Depth - the further the water moves toward the surface the size or area of the surface plume increases as more water gets in-trained or incorporated into the plume. I have always considered, right or wrong, at about 15ft depth the area of the original bubble production area is around double the initial pattern.
Bubble Size - Standard original bubble size is 1mm. As bubbles rise they also "grow" larger due to less air pressure at top compared to where they were produced deep. Increased pressure at the diffuser can cause bubbles to be larger especially in rubber or flexable diffuser 'skins'. Keep in mind that bubbles too small will tend to clog quicker and easier.
Surface Area of Diffuser - generally the bigger this diffuser surface area is, assuming the whole surface is covered in bubbles, the larger the final boil area. Different styles of diffusers produce different sizes of bubbles depending on style, water depth, and air pressure.
Rather than get into involved volume calculations just go to the Vertex website and look at their volume rating chart. This will give you a general or ball park idea of water volume moved by single 9" or multiple 9" diameter membrane diffusers for different water depths. Vertex has designed their brand of diffuser and actually volume tested their diffusers. Similar designs of membrane diffuser will likely be in the ball park but not exactly the same and most likely somewhat less (10-20%) of the water volume moved than the Vertex Standard. Remember it is important to try to create ASAP a solid mass of bubbles to begin the up lift bubble plume. Keeping diffusers or the bubble makers separate reduces the effects of the rising bubbles to work as a team.
I think this chart assumes each diffuser is receiving a minimum of 1.0 cfm of air and creating 1mm diameter bubbles.
https://www.vertexwaterfeatures.com/aeration-lifting-rates If you want the 'standard of the industry', Many of the Vertex sales reps will sell individual Vertex diffusers.
My rule is - daily moving some water is "usually" but not always better than moving no water.
