Quick Update.

Bought an inexpensive PH meter and have checked the water three times (8am, 12pm, & 5pm) for the past 3 days. All readings are between 7.1 and 7.4. The meter appears to be reading correctly as I've calibrated it without any adjustments needed each day.

I suspect the original meter is incorrect! I will not be using that gentleman again.

I have a biologist coming to do comprehensive testing early next week. Maybe he can advise on weed and clarity issues.

Thanks for the replies!