I have used a "python" to drain my tank right off of my 2nd floor balcony!!! It was dark so I don't think the neighbors even saw!! They probably though it was raining, I haven't used the sink for draining before.
i drain mine into the sink... i dont see a problem with it... im only concerned about filling water directly from the tap, but so far so good after 3 months. I think they are great!
I am on a septic system and I do not think I should add all that water to the system each month. I drain out the window. Love it. Probably would not keep aquariums without it. BTW I have 60 feet of hose so I can reach all my tanks, to make it easier.
I just leave the buildup alone and let it flake off and drain out during a water change. Its just ugly, thou its never been a problem. If im filling up the tank and the algea flakes enter the tank, the fish seem to like eating it!
i drain it outside with the water supply off so it just syphons out, then i use it for refils. pythons are cool cuz no buckets, worth it in my opinion but you can get away with a regular gravel vac with a long hose to go outside, then a regular water hose for refils.