Gaskets are the wear item.
The 6" cap gasket and the 2" outlet gasket are EPDM rubber. They harden with time, UV, and chemical exposure. Replace both every 2–3 years on outdoor totes, every 5 years indoors. Replacement gaskets are about $4 each — see accessories.
UV is the silent killer.
HDPE in direct sunlight will chalk and embrittle in 3–5 years. A UV-blocking cover extends life to 15+ years. If you can't cover the tote, position the long side north-south so half the bottle is shaded most of the day, and rotate the tote 180° annually so wear is even.
Freeze the contents, not the bottle.
HDPE handles freezing fine. The bottle itself can take a few freeze-thaw cycles. What cracks is the outlet valve and the cap. A frost-break valve cover (jacketed insulator) keeps the metal valve body above freezing on most Missouri winter nights — drop the valve below 20°F and the brass ball can stick or the polypro adapter can crack.
Drain fully between products.
If you're switching contents, drain the tote completely, triple-rinse with warm water, and let the inside air-dry with the cap off for 24 hours before refilling. The 2" valve drains the last gallon or two slowly — tilt the tote with a forklift to chase it out.
Track every tote.
Number your totes with a paint marker on the cage. Keep a one-page log per tote: prior contents, current contents, gasket replacement dates, inspection notes. When one fails, you'll know whether it was the third refill or the thirtieth.