Cherry pits as possible balance material in historic privy

In a recent excavation of a Boston privy, about 250,000 stone fruit pits (mostly cherry) found in Katherine Nanny Naylor's 17th century privy. The archaeology team believes the cherries were added fresh. I firmly believe they were being used to keep the system in balance. Does anyone have experience using fruit pits in a system? They obviously didn't break down too readily [see pic] Pits are a frequent find in middens and privies, even when charred.

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