Hi! First time posting hoping to get some help. Our pool/spa is 11 months old. 15k gallons, chlorine, Hayward cartridge filter, in Houston, TX, pebble tec. We've been using TFP since start up and have had zero problems I'm happy to report, only add liquid chlorine and acid (we have lots of water features that creep our pH up) on a regular basis. About one week ago we noticed a few brown spots. When we first opened the pool last year, we had a similar rust spot but noticed that there was actually a tiny shred of iron from the re bar that was poking through. Pool company came back and repaired that. So we suspected maybe it was similar, but there were more this time. Well today we notice that there are a lot more of them. I've attached a couple pictures, they're all on the deeper end and I tried brushing them away and they're not going anywhere. Water is crystal clear. I tested the water and went to Leslies just to verify my results. They're as follows:
My results using TF-100
FC 5
TA 70
pH 7.6
CH 300
CYA 40
results from Leslies:
FC 4
CH 230
CYA 40
TA 80
pH 7.5
Copper .2
Iron 0
Total dissolved solids 800
Phosphates 500
The lady said my metals were too high and recommended "Metal Free". My question is what could be causing these brownish rust spots and will Metal Free help. I don't want to start adding anything that is going to mess with my otherwise crystal clear, trouble free pool. Any suggestions would be greatly appreciated.
My results using TF-100
FC 5
TA 70
pH 7.6
CH 300
CYA 40
results from Leslies:
FC 4
CH 230
CYA 40
TA 80
pH 7.5
Copper .2
Iron 0
Total dissolved solids 800
Phosphates 500
The lady said my metals were too high and recommended "Metal Free". My question is what could be causing these brownish rust spots and will Metal Free help. I don't want to start adding anything that is going to mess with my otherwise crystal clear, trouble free pool. Any suggestions would be greatly appreciated.