What TPC 25 percent means in a kitchen
Repeated frying forms polar compounds linked to health harm. The regulation is not advisory for FBOs. Once TPC crosses 25 percent, stop frying in that oil.
You do not need a research lab every hour. Many brands use rapid TPC tests plus a fry-life SOP (hours, product mix, filtration).
The 50 litres per day record rule
FBOs using more than 50 litres of oil per day for frying must maintain usage and disposal records and send UCO to authorised agencies. This is the legal hook behind 'sell used cooking oil' in India.
After you stop frying
Cool, filter if possible, store closed, list on BioTradX. Do not pour into drains. Do not sell to someone who will bottle it as edible oil. That is a food-safety crime.
Sell at the TPC limit
Treat the TPC trigger as a sales trigger. The marketplace exists so the next step is a biodiesel feedstock trade, not a problem.