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Thread: First ever test - new pool

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    kkendall's Avatar
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    First ever test - new pool

    Just got the TF-100 kit yesterday. I took a sample from the pool inside to do the testing.
    Results

    FC 2.5
    CC 0
    PH 7.6 (didn't seem as light as 7.5 or as dark as 7.8)
    TA 120
    CH 120
    CYA 20

    I'm a total noob with this. Good thing tftestkits.net has videos to reinforce the instructions!
    Note - pool finished filling last Saturday afternoon for the first time.

    Recommendations?

    Thx
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
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    Re: First ever test - new pool

    What has been added to the pool at this point? Did the builder put some CYA in? when?

    You are going to want your CYA up closer to 40-50ppm, but depending on when the CYA was added it may not fully register yet.

    You CH is remarkably low given our usually hard water.

    You will want to keep a close eye on the pH and keep it in range as the new pebble (and slightly high TA) may cause it to drift up.

    Also, I would want to make sure you keep the FC above 3ppm at all times until you are certain of the CYA level.
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    kkendall's Avatar
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    Re: First ever test - new pool

    I don't know what the builder added....

    Pool was filled Saturday afternoon - I knew we weren't going to see anyone until Tuesday because the holiday on Monday, so I just watched the clarity of the water.

    Monday morning, it started looking a bit cloudy, so I put in 2 gallons of pool chlorine. Tuesday morning, it looked a little better, then the builder came out and fired up the pump. I see he left an empty gallon jug of pool chlorine, a gallon on muriatic acid (tiny bit gone), and some chlorine tabs. He also left a floater in the pool with some tabs in it. I checked it yesterday and they look like they are 70% gone now.

    After testing - and reading the materials in the pool school, I made a note to myself to
    * test CH again tomorrow and
    * go to the pool store later today to get some solid cynauric acid / stabilizer / conditioner to put in a sock and put it in the skimmer basket

    They are supposed to be back next Wednesday to provide the official orientation. I can't wait until Wednesday to start getting the pool water right.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Richard320's Avatar
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    Re: First ever test - new pool

    Quote Originally Posted by kkendall
    I don't know what the builder added....

    Pool was filled Saturday afternoon - I knew we weren't going to see anyone until Tuesday because the holiday on Monday, so I just watched the clarity of the water.

    Monday morning, it started looking a bit cloudy, so I put in 2 gallons of pool chlorine. Tuesday morning, it looked a little better, then the builder came out and fired up the pump. I see he left an empty gallon jug of pool chlorine, a gallon on muriatic acid (tiny bit gone), and some chlorine tabs. He also left a floater in the pool with some tabs in it. I checked it yesterday and they look like they are 70% gone now.

    After testing - and reading the materials in the pool school, I made a note to myself to
    * test CH again tomorrow and
    * go to the pool store later today to get some solid cynauric acid / stabilizer / conditioner to put in a sock and put it in the skimmer basket

    They are supposed to be back next Wednesday to provide the official orientation. I can't wait until Wednesday to start getting the pool water right.
    Unless the pump is running 24/7, don't put the CYA in the skimmer. Better to suspend it in front of a return, or suspend it from an empty bleach bottle floating in the pool. And shoot low when you add CYA. If you're low, you can add more easy enough, but high CYA is perhaps the most common root cause of problems on the board.
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    Re: First ever test - new pool

    Did a test today of the CYA.
    FC & pH were the same as before.

    Today I tested the CYA "outside" under the patio instead of inside. I think having the bright inside lights to my side allowed me to still see the dot in the bottom of the tube all the way to 20. Outside, with by back to the sun (even though I was in the shade), the dot disappeared completely at about 30.

    Learned something today!
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
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    Worked out a "plan"

    FC 2.5
    CC 0
    pH 7.6
    TA 120
    CH 120
    CYA 30


    This is a brand new pebble pool. (Filled 2 weeks)

    Note - The pool builder left the pool with pucks in the floater. The problem I have is - I don't know if these are the trichlor pucks or the calcium hypo pucks. They will be back Wednesday to give up the initial orientation on the equipment, etc. I s'pose I can ask then, but it will more than likely be a different guy that will just tell me he doesn't know.

    I'd like to know if this is a sound plan....
    (been busy reading pool school, etc about the chlorine options)

    The plan is - Puck refills will be the calcium hypo type until I get CH to about double. I will supplement with liquid chlor if the cal-hypo pucks aren't quite enough to keep FC up. After CH has about doubled, switch to liquid only.

    Make sense?
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: First ever test - new pool

    Cal hypo pucks are typically used for something other than swimming pools. I am almost sure you have trichlor pucks.
    Dave S.
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    Cal-Hypo ... for pools

    Cal-Hypo for pools

    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: First ever test - new pool

    oh.... what are the "Other Ingredients......52.4%" I know part will be CYA, but curious what the "skin softener" is. Don't like putting unknown things in the pool
    18x36 Vinyl IG ~27,000 gal, Intelliflo VF Pump, 300# Sand Filter, Polaris 280 w/Pentair Booster Pump, Pentair EasyTouch w/ IC40 SWCG
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    Re: First ever test - new pool

    Actually, Cal Hypo does not contain CYA. The other percent will be largely CH.

    Do you have a chlorinator for the Cal Hypo pucks?
    Dave S.
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    Re: First ever test - new pool

    Deck chlorinator plus the floater.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: First ever test - new pool

    Quote Originally Posted by duraleigh
    Actually, Cal Hypo does not contain CYA. The other percent will be largely CH.

    Do you have a chlorinator for the Cal Hypo pucks?
    Thanks. I learn something new every time I come here
    18x36 Vinyl IG ~27,000 gal, Intelliflo VF Pump, 300# Sand Filter, Polaris 280 w/Pentair Booster Pump, Pentair EasyTouch w/ IC40 SWCG
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    Re: First ever test - new pool

    Have you used these tabs in the past? With the deck chlorinator?
    Dave S.
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    Re: First ever test - new pool

    Quote Originally Posted by duraleigh
    Have you used these tabs in the past? With the deck chlorinator?
    Nope - this is a brand new pool.
    So far it has been two gallons of (10%) liquid to start (within 2 days of being filled) -
    then the builder came out and started the pump up, added another gallon and put the floater in the pool. I suspect they may have put a couple in the deck chlorinator, but I can't say for sure since there's nothing in there now.
    * 18.5 K Gallon, 8ft deep, IG, Pebble Radiance * Pentair VS 3050 Pump w/420 Cartridge Filter
    * Blue Square Q-360 In-floor Cleaning System * UltraPure UPP25 Ozone Generator
    * Pool startup: 09-04-2012 * TF-100 Test Kit

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    Re: First ever test - new pool

    Find out about the deck one - you can't mix trichlor and calhypo - you don't want a chemical reaction like that...
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
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    Re: First ever test - new pool

    Since those pucks say they "inhibit scale" in spite of them adding calcium to the water, I suspect that part of the other ingredients includes a metal sequestrant. I believe this MSDS is for the product you are showing, assuming that's HTH brand (from Arch Chemicals). It shows the following ingredients (sorted in order):

    Calcium hypochlorite ...................... 40-55%
    Magenesium sulfate heptahydrate ... 25-35%
    Water .............................................. 17-22%
    Sodium chloride ................................ 5-15%
    Calcium hydroxide ............................ 0-5%
    Calcium carbonate ............................ 0-4%
    Calcium chloride ............................... 0-4%
    Calcium chlorate ............................... 0-4%
    Sodium tripolyphosphate ................ 0.9-1.1%

    The tripolyphosphate is a strong chelating agent so will help to prevent scaling. The magnesium sulfate heptahydrate helps reduce how much calcium is added, though it will still be at least 7 ppm CH increase for every 10 ppm FC increase. Magnesium sulfate can be problematic since it is one of the worst salts to splash out onto concrete and soft stone surfaces since it has very high salt recrystallization pressure, higher than regular sodium chloride salt.
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    Re: First ever test - new pool

    Thanks Chem Geek for that info. More on the magnesium sulfate heptahydrate and tripolyphosphate: aren't both sulfates and phosphates typically undesirable to add to one's pool?
    18x36 Vinyl IG ~27,000 gal, Intelliflo VF Pump, 300# Sand Filter, Polaris 280 w/Pentair Booster Pump, Pentair EasyTouch w/ IC40 SWCG
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    Re: First ever test - new pool

    For the sulfates, they are a problem on their own at high levels because they can attack plaster and concrete surfaces, but you have to get pretty high before that's a problem. Even so, we generally tell people to avoid them and is one reason to recommend Muriatic Acid over dry acid or sulfuric acid.

    As for polyphosphates, when they break down they will become orthophosphate but we don't care so much about that and HEDP metal sequestrant will also break down to become phosphate. Though phosphate is algae food, if you maintain proper chlorine levels (FC/CYA ratio) you can kill green algae faster than it can grow regardless of phosphate level. That said, there really isn't any reason to add more algae food to the pool unnecessarily.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: First ever test - new pool

    In the past, Cal hypo tabs were intended for septic tanks and pretty much turned to mush after being submerged in water for any length of time.

    If you decide to keep these, we will all be interested in their performance.

    IMO, tabs are not good to put in skimmers. the super concentration of chlorine and other ingredients when the pump is idle can result in an "overflow" of staining onto the pool walls.

    I would not use them but HTH clearly thinks it's fine if you do.
    Dave S.
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    Re: First ever test - new pool

    If those tabs work they might be a good option for vacation for those who have a lower CH level.

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    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
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