This sort of stems from the softened water thread that was posted recently. It got me thinking about my water in my system. I've been curious about the PH level of my boiler and storage water. They are 2 different systems tied with a plate HX. I drew up a sample from each source and brought to work to check the PH. I haven't checked them yet because our meter is getting calibrated but the samples in the bottles look completely different. The boiler water was from my garden hose (hard water) and the storage was from my friends water softener. The boiler has typical nitrate treatment in it from boiler solutions and the storage has no treatment at all. Boiler is open system, storage is closed pressurized. I did a 3 rinse and 4th draw I saved in each bottle and here's how they look. So 2 questions Why would my storage water have the brownish look to it? And what is a safe PH range to run at?