nasty being algae growth, water clarity gets bad.
Unfortunately, I travel alot and Im not able to maintain the pond as
much as I probably should.
Is there something that I could do to maintain good quality, without
constant supervision?

Well, this worked for my friend's pond. Besides the waterfall (which was
way too small, imo) she got one of those foaming bubbling fountains. The
type that the wind won't blow it out of the pond if it comes up. Aeration
is what sounds like is your best option. If not a fountain, a large air
pump or 2, with good airstones would also help.

Course you really should check your water quality, you may have to decrease
the fish load. Nutrients are why you're having algae problems. ~ jan

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(Do you know where your water quality is?)