Jason and Bill
Thought I'd try your test out. Only problem was I didn't have any distilled water on hand yet and since I am on well water with reverse osmosis's system thought I'll give it a try till I get some distilled water. Test kit is a (cole-parmer total alkalinity k-9810)I've had this kit about 1 and 1/2 years now. Did the test to the exact measurements you stated. On this test kit range is 10-100ppm only problem is that it numbers only shows 50 to 70 and then 70-100 but did 3 different vials and each time was right in the middle of the 50-70 mark. Great test, was always wondering how long test kit was good for.
P.S I have a kenetico reverse osmosis system and should this still have worked ok. THANKS PO