Hello,  So I've been buying a few different products lately to get everything running 100% One of which is the marine accudrip, and I have to say I'm very pleased with this product. I got sick of trying to jerry rig something every water change or top off, and cause I only really keep shrimp or they're my main focus I thought why not? Easy operation from a wheel that rolls up and down governing the water flow. Well displayed drip to monitor flow. RRP $20 - bit much