An ode(r) to toilet juice

Oh M3 blackwater treatment, how I love thee
50 mL of enzyme twice a week.
Your faithful and constant breakdown of waste
Keeps the pipes from clogging with reek.

Quiet and modest, your presence is ignored
Gone once vacuumed down the pipe.
If it's yellow let it mellow, if it's brown flush it down
Why is our bathroom odor now so ripe?

For three days the smell is increasingly rank
Deck 4 starboard main vacuum line closed.
A row of cabins with toilets out of order
Even Febreze just disguises the waste decomposed.

Oh toilet juice, let me not forget you,
Keep our toilet pipes unclogged and free;
And our cabin will be sweetly scented,
No longer graced with the odor of pee.