I see.. you mean tanks that are enclosed in a wall. This supports the theory that heavy lids on unenclosed tanks help with noise suppression.
OMG I just realized that may be why the author experienced temporary hearing loss! The lids are designed to capture and reflect noise back into the tank water!!
(Sorry, a little too excited about toilet lids today.)
OMG I just realized that may be why the author experienced temporary hearing loss! The lids are designed to capture and reflect noise back into the tank water!!
(Sorry, a little too excited about toilet lids today.)