I have some boric acid on order from The Chemistry Store. When it gets here I will do a density measurement.
Any Pool Calculator feature requests for spring 2009?
- Thread starter JasonLion
- Start date
Could there be a spa version of the recommended levels? I see that for fiberglass, the recommended CH level is 220-320, but the Calcium scaling article says 150 and up for a spa, and then Chem Geek says not above 150 here. Maybe this indicates a lack of firm consensus, but the parameters do seem to be a bit different.
Thanks,
--paulr
Thanks,
--paulr
The numbers are different for a spa. Even though the underlying ideas are similar, the higher temperatures, frequent water replacement, huge amounts of aeration, and the dramatically lower amounts of sun light change nearly all of the details. Also, more of the steps for a spa are done using rules about what to do, rather than test results.
If you know of a definitive source for recommended levels for a spa I would be happy to put them in.
If you know of a definitive source for recommended levels for a spa I would be happy to put them in.
This forum is my most definitive source! Aside from what I pointed to previously, there's nitro's article How do I use Chlorine in my spa. It recommends CH=100-150, TA=50-80, CYA=20-30 or so (but up to 50 is really ok). There is also some talk about how FC ought to be nudged up a bit as well, compared to the usual FC/CYA chart, as FC doesn't last as long in the higher temps and especially with higher bather loads.JasonLion said:
--paulr
Because most spas do not have plaster/gunite/grout, the calcium levels can be lower. If too low, then foaming can occur. Normally foaming is inhibited if the CH is at least 100 ppm or so. You can have the CH be above 150 ppm, but it comes down to the saturation index that you can calculate with The Pool Calculator. Because the aeration in spas tends to make the pH rise and the temperature is also high, having the CH no higher than 150 ppm helps to prevent the possibility of scaling. If you watch your water chemistry, a CH of 200 is OK. 300 starts to push it.
Just keep in mind that the higher temperature of spa water has the saturation index be about 0.2 higher and that represents a CH difference between 300 ppm and 190 ppm. If one uses 50 ppm Borates in their spa water, then the risk of an unanticipated fast pH rise is far less likely.
Richard
Just keep in mind that the higher temperature of spa water has the saturation index be about 0.2 higher and that represents a CH difference between 300 ppm and 190 ppm. If one uses 50 ppm Borates in their spa water, then the risk of an unanticipated fast pH rise is far less likely.
Richard
I got my boric acid from The Chemistry Store. It is 20 Mule Team brand 
"technical grade" (whatever that means).
1 cup weighs 7.2 +-0.1 oz. The +-0.1 oz seemed to be some mixture of different amounts of tapping and not getting the measuring cup the exact same amount full each time. Without tapping I got 7.1 +-0.1, so not much variation really. Doing some conversions I get 0.86 g/ml.
I updated my Pool Calculator beta with my density measurement.
"technical grade" (whatever that means).1 cup weighs 7.2 +-0.1 oz. The +-0.1 oz seemed to be some mixture of different amounts of tapping and not getting the measuring cup the exact same amount full each time. Without tapping I got 7.1 +-0.1, so not much variation really. Doing some conversions I get 0.86 g/ml.
I updated my Pool Calculator beta with my density measurement.
JasonLion said:
Thanks Jason, great job. I downloaded it and it works great. This will be very handy indeed, at least until I drop my iPhone in the pool while entering my test results.
Marc
Hi Jason,
Got the pool calculator yesterday for my I phone. This means I do not have to take my laptop out to the pool as often to do tests.
Thanks
Susan
Got the pool calculator yesterday for my I phone. This means I do not have to take my laptop out to the pool as often to do tests.
Thanks
Susan
I received my Boric Acid from The Chemistry Store and I measured it's density and got 0.99 g/ml. This is after tapping the measuring cup to settle the product which is what I usually do. So perhaps what they sent me is ground a little finer. 2 cups (473 ml) measured as 16.5 ounces weight (468 grams).JasonLion said:I got my boric acid from The Chemistry Store. It is 20 Mule Team brand
1 cup weighs 7.2 +-0.1 oz. The +-0.1 oz seemed to be some mixture of different amounts of tapping and not getting the measuring cup the exact same amount full each time. Without tapping I got 7.1 +-0.1, so not much variation really. Doing some conversions I get 0.86 g/ml.
I updated my Pool Calculator beta with my density measurement.
Richard
JasonLion said:
What about my S60 phone?? I jest, I jest. I've got an iPod touch lying around here somewhere that could finally be put to use. 8)
Seriously, thanks for the Pool Calculator! It is extremely helpful!! :bowdown:
I would like to see a version of the calculator formatted to fit a pocket pc screen like 320 x 240 resolution. I currently have the web page downloaded on my phone and then I open it up in internet explorer and do my calculations. This works OK, I just have to scroll a lot to enter and view data. I like using the phone so I don't have to bring the laptop out to the pool. Love the program though, it is a real time saver.
I am not sure it is worth it--but I would like to be able to enter a range instead of a point target--Then the PC would calculate chems needed to reach the near side of the range. This would save having to rejigger targets because you have moved from below target range to above target range. Other than that minor quibble, current version does everything I need. Thanks for your work on this.
Durk, thanks for the suggestion. I will add that to my wish list for possible inclusion in a future version.
Thanks a million for the app and the calculator jason. This is my second year being a pool owner and the calculator has made life so easy.
i am interested in pool calculator, who can send me a picture and all specify about it
thanks
thanks