Yea I had 4 whisper filters that I've replaced all of them.
LOWSEY PRODUCT!
For the filter floss in your aquaria the only way to avoid that that I found was to replace the filter ever 3 weeks or so. The filters are cheaply made, and very un effective.
I would defiantly take malkore's advice and get a AquaClear HOB filter.
for the hazy water, you might try CO2 ejection, once I added it, that went away for me. I would also do water changes of 20% every day for some time to try and clear the water up.
If you're seeing bits of plants in your tank you need to prone your plants down a little and try vacing. I know it's bad if you have plants but I've found if I use a smaller vac I can pull the junk off the surface of the gravel and not mess with the roots of my plants to much. Right now I'm using a vac designed for a 10G tank.
Oh yea even if it's bacterial bloom or green water....NO CHEMICALS
Good luck!