hydro-pneumatic bladder and captive air tank are all common names for this water storage tank

Always from reputable manufacturers

Basically you use the waste water from the first membrane housing and feed into the second membrane housing which works if you have sufficient water pressure to the unit

Close the ball valve and note the PSI pressure on the gauge

Triple Filter Bracket (Steel) NSF Certified hydro-pneumatic bladder and captive airTriple Filter Bracket (Steel) This is a powered coated steel triple filter bracket. It can accommodate up to three standard 10 " filter housings. It is white in color and very sturdy. Dimensions and Weight Dimensions: Width: 14. 0" X Height: 2. 0" X Depth: 5. 75" Weight : 2. 0 Pounds