a.) If a filter is installed incorrectly, rather than using it as a filter system to discard dirt,it becomes a debris collection system.
b.) The smoothing inlet and siphon can be installed incorrectly.
c.) If an overflow was not built into the tank.
d.) The rainwater is taken directly from the bottom of the tank and not from floatation.
e.) The potable water feed for drinking water is not adjusted correctly (waste of water).
f.) The cables routed out of the tank are wavy.
g.) Certain lines were installed without making it possible for main water disposal to connect to the open potable water feed.