Only problem is that tap water in my area is about 65 to 70.
Their range of upto 29, is water purified only about 50%.
Other problem is that you do not know when they replaced their filter units. So yes, maybe this time when you fetched water, the TDS is 6. But next month? So I would suggest to test that TDS every time.
Lastly, what makes that TDS of 6-29? Is it good or bad particles? 29 as in copper, NO.
Ozone, O3 is extremely unstable. The most corrosive agent out there. I doubt if it will even be in your bottle as O3, within 10 minutes of bottling the water. Never mind even opening it. Also O3 is extremely dangerous to your health. But you can drink that water directly after opening. Just to proof my point.
O3 got a faint smell to it, as if something is rotting, orange whatever. Actually it does not smell at all. That what you smell is actually the slime layers and skin in your nose being broken down and decomposed by the O3. The moisture in your nose reacting to the O3. YIKES. Also your eyes will feel scratchy, same thing, the O3 reacting with the tears in your eyeballs, breaking it down.
So what will happen with your water at TDS of 29, is that it will provide a lot of minerals the O3 can combine to easily. Breaking complex down into simpler chemical compounds. And these would be easier for your skimmer to remove it. So I would reckon if you want to use this O3 purified water, add it to your skimmer compartment.
I got no documents or links to back the last statement up, about skimmer compartment. Just what I know about running Ozone on your tank, and normally the skimmer is used as Ozone chamber.