Water flows into it automatically. 【High-quality material】: This Sponge holder is made of excellent ABS plastic,, he will not rust when he touches water, drop-resistant, durable, to meet your daily needs. 【Perfect for Kitchen Sink】：Sink sponge caddy shelf works well for organizing or storing your kitchen sponge, vegetable scrubber , scouring pad, drain plug, dish soap, food scrappers, brushes, hand soap dispenser, scourer and other dish washing supplies.