Since the first post i made on this thread some things have changed...
Ive bought an oakton ph/tds tester. Should've gone with EC instead of TDS but oh well...
My water comes out at a surprisingly clean 80 PPM out of the tap. Ive heard of it being as high as 600 sometimes. When that high, you should definitely get a Reverse Osmosis filter. Or just go to one of those water dispensers and get your water there in 5 gallon jugs. That may work depending on how big your garden is.
I then leave the water out in a 40 gallon reservoir, where it is cycled with a pump. I leave the air stones off until it is time to water. I also use an aquarium heater to heat the water to a cool 68 degrees. After one day (24 hours, sometimes as few as 18, but usually not less than that) the TDS goes down to about 60. Not bad, about a 25% reduction, but I dont know if that works exponentially or not. Also, when I pour the water out at first from the tap I can DEFINITELY smell chlorine. After the 24 hours, its gone.
Ever since I started doing this, and although I have made other changes, as well, I have noticed a BIG difference with my plants...
Happy growing!