CYA in a sock

[polyvue]

I have performed similar experiments and it has taken about 36 hours with pump running for the full amount to show in the best test I had. Then again I was not testing evey hour since it's a waste of reagent, IMHO

I have too much reagent.

Also, by my calculations it should take 37.3 oz of CYA to raise 14k gallon by 20 ppm (and I don't use the pool calculator) so we agree there. Have you verified that your pool is 14k?(There is a way to chemically determine the gallonage of the pool using a modification of the Taylor TA titration to give you a result of 1 ppm and baking soda if you are interested)

Have gone to great pains to estimate pool volume, including Free Chlorine and Total Alkalinity titrations (I have pages of notes on the latter if anyone is tired of Seinfeld re-runs), geometric summations, various formulae (including one you authored for estimating spa volume, posted on I forget which forum).... of course, all this effort just made me less sure about the correct volume!

If not then the experiment should be carried out with testing for a few days until the CYA no longer rises to make sure you have reached the endpoint of your experiment.

Point taken. We'll see what tomorrow brings.

Also the water flow has a lot to do with how quickly it dissolves so this is definitely a case of YMMV. FWIW, when i have used a skimmer sock and put the CYA in that it stayed in the sock for a few hours before there were no traces left. Also, water temp will play a small part here since CYA is very slightly more soluble in hot water(but again, the difference is slight.)

Yes, I suspect the velocity of the water (elaborated by chem geek in an earlier post), flow rate and temperature have a lot to do with it. I recognize that my pool has a comparatively high rate of circulation and turnover. I don't claim to have overturned any physical law or to have procured magic cya beans that dissolve faster than the usual stock of cya commonly available.

There are really just too many variables which is why it is safe to say retest in a week. This ensures that the CYA has dissolved and that you are not wasting reagent (although those that sell test kits often want you to waste reagents and have to buy refills).

Yes, it's safe (and in some forums, seems to be the law) to suggest waiting "at least a week" before testing CYA. But, like the "filter for a minimum of 8 hours" rule, there are evident exceptions. For good or for ill, my pool seems to be one.

[CarlD]

Our only "laws" are against promoting things that are down-right dangerous because they cause injury, disease or go "Ka-BOOM!!!". We are particularly wary of things that leave you in danger while lulling you into a false sense of security.

Also anything that is not legal or questionably legal is a big no-no here.

[waterbear]

Have gone to great pains to estimate pool volume, including Free Chlorine and Total Alkalinity titrations (I have pages of notes on the latter if anyone is tired of Seinfeld re-runs), geometric summations, various formulae (including one you authored for estimating spa volume, posted on I forget which forum).... of course, all this effort just made me less sure about the correct volume!

If you have not used this method you might want to give it a try. It works.
http://www.poolhelp.com/ChemicallyDe...oolVolumes.pdf

Here is the link for the "“Simplified Formula Numbers” chart
http://www.poolhelp.com/SimplifiedFormulaNumbers.pdf

FWIW, this is the chart I use to calculate dosage amounts for chemicals by using the formmla:
(Volume of pool / "forumula number" for desired chem from chart) x ___ ppm desired change = ___ pound or quarts of desired chem needed

SO for a 14k pool where you want to increase CYA by 20 ppm it is
(14000/120000)x20=
.1167x20=2.33 lbs. CYA
2.33lbs x 16 oz/lb =37.28 (which rounds to 37.3)

[CarlD]

Oh, I forgot: The other BIG law here:

No selling stuff. Period. Ever. No exceptions.

So...what kind of sock is best? Hanes? Gold Toe? Athletic Nikes? Ladies' pantyhose? Colored or white?

I have these great Tilley brand travel socks--soak them in a sink and they dry in 2 hours--"Two pairs will take you around the world!" How do they work?

I mean, how can you compare the "Sock" vs "Skimmer" method unless you can get hard info on how different socks perform?

[AnnaK]

Great links, Evan. Thanks!

[waterbear]

So...what kind of sock is best?

I have always had a preference for seamed nylons on a shapely leg.

[CarlD]

I have always had a preference for seamed nylons on a shapely leg.

TMI, Evan, TMI!

[waterbear]

TMI, Evan, TMI!

I don't mean MY leg!

[Watermom]

You guys are crackin' me up!

[CarlD]

I don't mean MY leg!

That's a relief--but still TMI!

(but we got Lisa laughing! )