When you say 'fill up the bucket'....are you going almost to the top, as in, 4 1/2 -5 gals every week ?
That 'seems' like a lot, for this time of the year...'?' It has been a pretty warm winter here in central FL....maybe out there too ? If I remeber, your system is on the roof (?)....maybe your having a lot of evap from winds too ? Come summer, this may become even more of an issue.

It's interresting, your 'add up water' has the same PH as your system's water. I'd consider pre-treating the water for ph and chlorine.

Quote Originally Posted by alex281
doesnt the chlorine effect fish more than plants?

I'd say yes....UF may have more details on 'how much' chlorine effects plants growth.