You can refill your candle holder once the wax has burnt down to ¼”.
Our wax is so soft that it can be scraped out with a spoon and you can then remove the wick and use the remaining wax as a wax melt. However for other makes of candles, use the following methods:
Fill the candle holder to above the wax line with boiling water. Let water cool and the wax should be soft enough to be able to scrape out with a spoon.
Alternatively you can place your candle holder in the freezer until the wax has frozen. Use a teaspoon to run around the edge of the wax and slide it under the wax to pop out the candle.