Quote: "The accumulator will place a low-restriction, adequate-volume supply close to the device'
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Perhaps he needs to clean the "lime-clogged" toilet discharge outlets in the bowl itself?
My point is - water pressure ONLY fills the holding tank/accumulator. That tank's capacity is critical to the flushing efficiency of a toilet bowl. Ever hear anyone complain about the new "green" low-capacity-toilets, that use less water with each flush?
Increasing the water pressure to five hundred pounds PSI might fill his toilet TANK in .00276 seconds! - or old, clogged pipes may take an hour to fill the tank, but (1) pressing the handle (2) raises the rubber ballcock and then (3) GRAVITY and the afore mentioned design of the bowl will determine its efficiency at how it flushes.
* Unless his toilet is somehow plumbed directly to the water inlet pressure!