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Hello TFP! We have an in ground chlorine pool, just finished construction in the Houston, TX area. We’ve had some heavy rain and we are noticing stains on the deck that look like it’s washing from the travertine coping onto the spray decking. The stains do not scrub off. Any idea what they are...

We are just finishing construction on our pool, approximately 20,000 gallons, gunite and plaster with a pebble finish. PB is doing startup on Monday but I wanted mess around with my TF-100. I tested our tap water and it had a FC of about 2.5. I didn’t test CC but the water has a noticeable...