Need some tips on t-fitting coolant flush

[Giraffe]

I'm planning to do a real good flush of the car in the coming weeks and would like a few tips.

Do you usually hook up the fitting to the heater core outlet hose so as to backflush the heater core? Do you remove any hoses when doing a flush like this? The instructions on the package aren't entirely clear and I haven't been able to find a good write up on this. I have about a three foot length of ¾" hose I snagged from my '66 Mustang that I plan to use in place of the stock heater hose (I don't intend to leave the fitting installed).

Here is what Wichita Falls says about its own water: http://www.wichitafallstx.gov/474/Water-Treatment Does that sound like anything I want to put in my radiator?

The radiator and water pump appear to be new-ish, or at least non-stock units. I'm planning to replace the fan clutch while I'm at it but will leave the current radiator, heater core and water pump in place because I don't want new components to get contaminated with whatever gunk may still be stuck in the block. Plan is to start accumulating new parts (already have a new Motorcraft heater core) in the coming months to go in when the motor gets rebuilt.

[sly]

NEVER put tap water in your radiator. Buy distilled water and mix or get pre-mixed. The sediment in tap water will mess shit up. Not to mention the corrosion the chlorine will cause. I put the flush T in any heater hose I have access to that has a long enough straight segment to cut into. In the box, it's on the line TO the heater core before the TBL (which has been removed now because crap). This creates a point of resistance going into the heater core and helps prevent pressurizing it. This keeps the leaks demon away. Cause you know we all just love to remove the entire dash to get at the heater core to replace it. On the aero, it's the same story. The feed line gets the T. The whale doesn't have one yet. It will get one the first time I have to flush it though (which may be never since I have a good shop to take stuff to for crap like this).