farwellbooth Posted August 4, 2014 Report Share Posted August 4, 2014 I'm a bit of a newbie on my second water change after four months on a Caldera Cantabria. The current water is about 3 months old and recently changed to a very slight green color. The bromine level has always been at least 3 and I shock weekly with a cup of bleach. I shocked a couple days ago and it's a very slight green. It's not that easy to notice but the shell is a shiny pearl white and and I noticed it change from blue to green at about the 3 month interval. The new water always has a slight blue hugh. Again the green does't look swamp like, crystal clear green if that's possible. That's what I have. My ph is 7.8, alk 75, Ca++ 180, tBr 3.0. I use the occasional foam down, weekly clarifier, and occasional enzyme. Weekly shock with 1 cup of bleach, and leisure time renew tabs with higher bather load. May be time for water change although it doesn't look dirty at all. Only I would even notice the slight color change. Many thanks! Quote Link to comment Share on other sites More sharing options...
chem geek Posted August 5, 2014 Report Share Posted August 5, 2014 Clear green is usually metals of some sort. Copper is usually green; iron is usually yellow (to red/brown) and can look green against a blue background. Since our shell is white, the green sounds like copper, but unless you added a copper-based algaecide or your pH got low to corrode copper in a gas heat exchanger, I'm not sure where the copper comes from. Unless it bothers you, I wouldn't worry about it since it sounds fairly faint. If you lower the pH and it turns more clear, then it is likely to be metals -- in that case, you can add a metal sequestrant product. Quote Link to comment Share on other sites More sharing options...
Greenhorn Posted August 17, 2014 Report Share Posted August 17, 2014 I used bromine on my first fill of our new tub. I had the same thing happen to me. My water was in perfect balance, and I checked the sanitizer levels almost daily. My family used the tub all the time, so our bather load was huge. After about a month and a half, the water took on a green tint. I have no idea where this color came from. I did start to use a defoamer on occasion, but that was the only chemical I added besides the bromine tabs and chlorox bleach. I have since switched to the dichlor then bleach method, and I love it. The water seems to be staying sparkly clean, and it costs less than the bromine method. Quote Link to comment Share on other sites More sharing options...
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