brown spots in the tub

[stujoe]

hi guys. I,m a nubie to hot tubs but finally got one due to my wifes persistence..lol..having a little trouble so here I am on this forum..so just sayin hi first..
tub is 6 months old 725 beachcomber. using clor blast.this is my second water change. my levels are ok the clorine is a bit high tho. I use city water that is really soft and have to harden it up a bit when I do a water change.....my problem is that is get brown spots in the tub (more on the seats and the bottom) if I let it sit for a day or two...it feels a bit gritty cant seem to put my finger on it...any suggetstions....
thanks stu

[kporter]

Ever had your water tested for metals?
Are you using a metal guard / stain preventor upon fresh fills and monthly?

[stujoe]

no I haven't yet...I would think that our city water is good, like I said I have to soften the water when I first fill the tub.. and no im not using metal guard...I don't get any rings in the tub or in our toilet for that matter. ( not that we swim in there )
I just don't know why that its almost like grit and only happens when the tub doesn't get used for a few days..

[kporter]

My advice to is to get your water tested by a lab and let them know of the issue you are experiencing before they begin the test.

[Sam]

Are you sure that your PH and Alkalinity are in the proper range.  If either are too high, they can cause metals to precipitate out of the water.  Just a guess.