So will I have to spend a lot on refurbishment?

ABSOLUTELY NOT; we designed ecobug® tough biological urinal caps to be a universally fitting system to accommodate most urinals, even those with open cast drains. However, we do recommend that a flat drain strainer is used so we may apply our enclosed ecobug® Extra Strong Urinal Caps for maximum effectiveness which will incur a minor cost. Please see our guidance for use notes on deploying the ecobug® washroom management system solution for more details about this.