I drink about 1L/day I use to get kidney stones all the time. Told to stop drinking tea and dark sodas. After researching it for 10 minutes my Urologist didn't know what he was talking about.

Contents of Oxalate:

black tea 15 grams for 1 liter equals 15 * 5.11 = 76.65 milligrams of soluble oxalates

Spinach has 645 milligrams of soluble oxalates per serving size!

Cola sodas has 0 as in ZERO soluble oxalates per serving size.

My doctor told me that was all new to him. I stopped going to him as a doctor. I ate spinach everyday. I stopped eat spinach I stopped having kidney stones.

Exactly what kind of tea do you drink? Is it iced tea, a brand?

You might be drinking too much. See http://www.livescience.com/50347-iced-tea-kidney-failure.htm.... That person was drinking about 2.5 times your intake but it might wise to throttle back a bit. You might not reach kidney failure but might reach levels that impair function or which leave you vulnerable to toxic oxalate buildup if you eat other oxalate rich foods.

I finally found a good study on this,

http://apjcn.nhri.org.tw/server/apjcn/11/4/298.pdf

"The results from this experiment show that while a regulartea drinker would be consuming oxalate every day, the levelsare modest when compared to the amounts of oxalate thatcan be found in other common foods. It would be verydifficult to consume an excessive amount of soluble oxalatefrom the regular consumption of black tea without milk. Theconsumption of black tea with milk would mean that smallamounts of oxalate would be absorbed on a daily basis andwould place black tea in the low risk group of foods, asdefined by Noonan and Savage".

Seems like damage is minimal and only some people will form calcium stones to begin with. For me this means I'm not going to make any concern out of it unless I hit an issue.

I did find one oft-repeated anecdotal case of a guy who consumed ~4L+ of iced tea per day and had more major issues, but I didn't see any other examples of this.