Quote:
Originally Posted by Mo_Gearhead
Water "pressure" has little to do with the way a toilet flushes. At least the older ones.
The "volume" of water released and how the bowl is designed (water outlets under the rim, their angle, and the design of the discharge chute/trap) are the determining factors. The water pressure ONLY fills the holding tank - the rest is gravity, so additional volume is what you need.
*Unless you are in an aircraft! 
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Mo,
If you amend that to read "volume over time", I agree.
His problem is old lime-choked plumbing in his building is restricting the water flow, which is all-important to this style of unit. The accumulator will place a low-restriction, adequate-volume supply close to the device, which should allow it to perform as intended.
Les