When running a faucet you will need to place ads on your pages. Advertisers use ad networks to place their ads on various websites. You would need to register with those networks and get your website approved depending their requirements. This is usually dependable on design and Alexa ranking.
Below is a list of verified ad networks that accept faucet websites.
||S50,- BTC or ETH
*Only selected ad networks that have the pay option in cryptocurrency. CPM and payout thresholds are subject to change.