I have the siphon / gravel vacuum from Aqueon that attaches to a sink faucet. It's just like the Python. The manufacturers of both products promote the no-buckets
convenience of removing and replacing water with these tools. To date, I have ONLY used the product to remove water and to vacuum the gravel. I have been reluctant to add water directly from the tap for two reasons: (1) it is difficult to control the temperature when mixing hot and cold to match the 75degF temperature of my tank, and (2) I am unsure whether I can safely add water containing chlorine and chloramine even if I dose the tank with Prime immediately after the refill.
I don't mind the extra step of conditioning water first in my 5-gal bucket, but I do find that pouring water - however slowly - from that bucket is a bit violent, i.e. it dislodges my banana plant every time and disturbs the gravel substrate. Note that I do not pour the water over a plate or similar baffle because I need two arms to wrestle the 5-gallon bucket.
Now, I certainly could use a smaller container to transfer conditioned water from the 5-gal bucket to the tank in multiple iterations. But that's less convenient still.
So before adopting that approach, I'm wondering:
1. whether it is safe to go from tap to tank if I add Prime immediately afterward, and
2. whether anyone has any tips or tricks for controlling the temperature of the tap water.