Assuming I won't drop any solid piece of Flourite into the sink, will it be alright to rinse it in there? I've rinsed Flourite inside the tank itself in the past using a syphon, but that is way too much work because I have to constantly fill up the water in the tank with a bucket. It'll be so much easier to let the water run in the sink, but are the Flourite particles safe to be drained down the sink?