Im a little late to the party, but...
I was looking for suggestions on how to start integrating some more Pool calculation stuff. We have to think total beginner that knows nothing about this stuff. So I was thinking that most people do not know what their target numbers should be so this app would try to figure that out for you.
Perhaps have a prefilled entry that suggests what the target value should be. But at the same time, make it editable so that an experienced user could manualy overrite the value if they choose to.
... So I was thinking that you could put what you are currently using for your sources of chemicals in the settings and it will work off of that so it will will give you direct additions for what you are really using.
I like this idea! remove some of the un-needed clutter when you know you are not using xyz tabs for chlorine, ect...
The only downside of this is that you would still have to use pool math if you wanted to say get your pH down to a 'known number' like 7.2 so you can lower your TA or something. But I was thinking that this app needs to be for anyone including the ones that want this to just tell them what numbers they should be at without having to know.
Umm, any chance TFP / PoolMath owner would be willing to share their code or formulas with you so that you can put the calcs directly into your tool? would solve the need to link back to the TFP / PoolMath site.
Alternatly, you could just put a link right there in your app back to TFP / PoolMath page. User would still have to type the value in, but at least they would have an easy shortcut there to follow.
I like the idea of keeping track of what is added and when. Could pull the entries from the "settings" page and have the user just type a value in a box. "___ oz Bleach 10%" added "9/19/16 4:03pm" would be there waiting for an entry, etc
If you are still looking for testers, I would be willing to help. I've been wanting something better that iOS Notes to log data. I tried Excel but found that I wasn't too good at logging into the computer to add data. I always seemed to have my phone nearby and could easily just enter the numbers and notes.