At some point you may need to address pre-filtering or an alternative for your source water.
In the meantime, Prime gives you some advantage in the temporary detox, but this will only work as long as you do 50% (or so) water changes at least every 2 days.
You might also find value in using API Nitra-Zorb in your filter. Nitra-Zorb is a 'scavenger' resin that adsorbs ammonia, nitrite and nitrate. It can be recharged many times with ordinary non-iodized salt.
...Or, another product that looks very intriguing is API Bio-Chem Zorb. It contains additional 'scavenger' resins that adsorb and remove a wide range of pollutants and toxins.
(In your case, I'd likely go with a pouch of Nitra-Zorb and assuming you have municipal water with chlorine/chloramine, only use the Prime to condition the amount of water in your water change. (For now, I would refill using 5g buckets. For Prime, using a childs medicine dropper, it's 2 drops per gallon. 10 drops in 5g - mix well.) If you continue to fill in the aquarium, add 1 capful before refilling for a 55g aquarium.
Also as boredom pointed out, this post may be worth a read if you haven't already: http://www.tropicalfishkeeping.com/f...-water-156489/
Good luck and keep us posted.