Ken, Can you edit the OP (first post) and include a suggestion/bug list. Strike/mark completed items. That way, as we are helping you, we have one place to go to see if a suggestion/bug has already been mentioned.
Three suggestions:
1. Add friendly alerts/reminders, at the top of the advice page or flashing button on main page, ie, "You have not tested TA in 20 days. Recommend testing", "You have not tested PH in 8 days. What is you problem

", "You have not tested Chlorine in 33 days. Enjoy your Green Swamp

" Time frame from TFP recommendation or user adjustable.
2. Much harder and I assume you would have to work with the forum host. Allow a user to store TFP login info, click a button and submit data to TFP. TFP could display the statistical results of that data. Show how many pools your app is tracking, types, consumption rates, borate comparison. Yes, a lot of work but it would be cool to actually see the statistics.
3. Another difficult idea that I have not thought through yet. Add an optional price tracker so you can calculate annual cost.
Very cool app

Do you plan on providing a reduced function, ad supported free version?
