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Thread: New tests results completed - few questions

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    steveb21's Avatar
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    New tests results completed - few questions

    I turned a black swamp into a clear pool a few months back after completing a 40+ day SLAM.

    At the time my CYA was 60. I have been maintaining FC of between 5-9 for the last few months. Pool has hardly been used in that time and i was averaging a loss of 3ppm (900ml liquid chlorine) FC in 24 hours.

    A few days ago i noticed my pH had risen to 8.0 so i have been gradually reducing that down.

    Just completed test results

    FC 8
    CC 0
    pH 7.2
    CH 280 (aim is to get this to around 350)
    TA 80 (was 100 before i started reducing pH)
    CYA 40 (did 5 tests and i average 35, i take it i round it up to 40?)
    CSI -5.2 (Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools. - What do i need to do to reduce this?)


    Questions,
    *What is/are the reason for my CYA to drop? Have had a bit of rain last few weeks, which i understand could be the reason pH has increased but im not sure about the CYA?

    *Since dropping my pH i have noticed my FC usage has decrease over 24 hours. Is this normal?

    * Am i correct in thinking as i have been targeting FC of 9 when (as linked to CYA of 40) it should have been FC of 7 that this could be the reason why more FC was being used?

    *So to maintain, min FC is 3, target is 5-7. Do I start with the new figures from now or should i increase CYA? (i have some pucks which the previous owners left behind).
    Outdoor Inground Heated Concrete Tiled Pool - 25ft x 12ft and 3ft 4" to 6ft 6" deep - 45k Litre Water Capacity
    Valve - Hayward Vari-flo 711-13 ------ Pump - Sta-Rite 5P1R
    Filter - Hayward S244T -------- Test Kit - Taylor K2006C

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    Mod Squad Jimrahbe's Avatar
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    Re: New tests results completed - few questions

    Steve,

    I see that no one has answered your question yet, so I'll give it a shot...

    I'm not sure why your CYA dropped, but CYA will go down a little on its own and splash out and a little leak could also cause it to decrease.. The test itself is +/- 10 ppm so if you combine all that, and it would not take much to go from 60 to 40..

    pH has little effect on FC usage, but you really can't tell anything in a 24 hours.. There are so many variables, like the temperature, the amount of sun, and the amount of FC vs. the CYA, that could effect the readings.

    It is true that if you have your FC a lot higher then it needs to be, that the additional FC will burn off quicker.

    If you don't have a saltwater pool, then a CYA of 40 is just fine.. I would leave it right there.

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Calder Spa.

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    Re: New tests results completed - few questions

    To fix your CSI get your CH up and let your pH get up higher.
    13k Pebbletec Pool/Spa, Hayward Ecostar, SGS Breeze 540 SWG, Pentair C&C 420 cartridge, Pentair MasterTemp Heater, Caretaker system, TF-100 & Taylor K1766 test kits

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    steveb21's Avatar
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    Re: New tests results completed - few questions

    Should have the CH Increaser tomorrow so will get the CH raised to 350-400.

    It has been 3 days since adjustments and my FC usage has been 1ppm loss in each 24 hour period covering the 3 days - Current reading is 6.

    As i said before i was losing 3ppm of FC in 24 hours before i made the adjustments. Just trying to work out whats going on.
    Outdoor Inground Heated Concrete Tiled Pool - 25ft x 12ft and 3ft 4" to 6ft 6" deep - 45k Litre Water Capacity
    Valve - Hayward Vari-flo 711-13 ------ Pump - Sta-Rite 5P1R
    Filter - Hayward S244T -------- Test Kit - Taylor K2006C

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    Foxy's Avatar
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    Re: New tests results completed - few questions

    Up to 4ppm of FC loss in 24 hours is considered normal loss, so your FC loss has been fine. FC loss will change with different factors including weather, amount of bathers in the pool, using a cover etc. CYA of 40 is good if you don't have a SWG, target your FC at 7ppm.
    Kristin in Henderson NV. Newly Renovated 07/2017, built 99/00, owned since 2012. 15k free form, IG Gunite, Barbados Blue Quartzscapes Plaster, Hayward Cartridge filter, Hayward variable speed pump, TF-100 Test Kit, Walnut Travertine deck & coping.

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    lightmaster's Avatar
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    Re: New tests results completed - few questions

    If you're only losing 1ppm FC each day, consider yourself lucky. I lose 3-4ppm each day, mainly because my pool gets full sun from sun up to sun down.

    You'll lose FC period, sometimes at a slow rate, sometimes faster, depending largely on how much sun your pool gets and how much organics get into your pool, whether that's leaves, bugs, or skin cells and oils from people. Too much FC loss each day means you need to raise your CYA up a little to slow down the loss, but I wouldn't worry if you think you're not losing enough. That just means your pool is very clean and there's nothing for the chlorine to react with.
    Pool Stats: 18' X 48" Vinyl AG - 6,700 gal - Hayward Power-Flo LX 1hp and Easy-Clear 40 sqft cartridge - installed 6/30/17 - high iron well water - My AG Pool Mods
    Helpful Links: Pool Logger - PoolMath - TF100 test kit - Recommended Chemical Levels - Extended Test Kit Directions - Chlorine/CYA Chart - Chlorine Date Code Calendar (<90 days) - Polyfill Iron Removal

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    steveb21's Avatar
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    Re: New tests results completed - few questions

    yep, im pretty pleased that my Chlorine useage has dropped... but just wondered why.

    Last 24 hours i have recorded no FC loss, can that even be possible? In 5 days i have had a loss of just 3.5 FC. I will be pretty happy if its stays that way but just making sure nothing else could be effecting the results.

    12/08/2017 14:00 8
    13/08/2017 16:00 7
    14/08/2017 16:00 6
    15/08/2017 16:00 4.5
    16/08/2017 16:00 4.5

    My CC results have been 0
    Outdoor Inground Heated Concrete Tiled Pool - 25ft x 12ft and 3ft 4" to 6ft 6" deep - 45k Litre Water Capacity
    Valve - Hayward Vari-flo 711-13 ------ Pump - Sta-Rite 5P1R
    Filter - Hayward S244T -------- Test Kit - Taylor K2006C

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    lightmaster's Avatar
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    Re: New tests results completed - few questions

    Quote Originally Posted by steveb21 View Post
    yep, im pretty pleased that my Chlorine useage has dropped... but just wondered why.

    Last 24 hours i have recorded no FC loss, can that even be possible? In 5 days i have had a loss of just 3.5 FC. I will be pretty happy if its stays that way but just making sure nothing else could be effecting the results.

    12/08/2017 14:00 8
    13/08/2017 16:00 7
    14/08/2017 16:00 6
    15/08/2017 16:00 4.5
    16/08/2017 16:00 4.5

    My CC results have been 0
    Does your pool get any sun at all?
    Pool Stats: 18' X 48" Vinyl AG - 6,700 gal - Hayward Power-Flo LX 1hp and Easy-Clear 40 sqft cartridge - installed 6/30/17 - high iron well water - My AG Pool Mods
    Helpful Links: Pool Logger - PoolMath - TF100 test kit - Recommended Chemical Levels - Extended Test Kit Directions - Chlorine/CYA Chart - Chlorine Date Code Calendar (<90 days) - Polyfill Iron Removal

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    steveb21's Avatar
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    Re: New tests results completed - few questions

    Its the UK so we hardly have sun

    The above days though it has been cloudy and we have had the odd rain shower. Sunny days the pool has sun for a good 8 hours.
    Outdoor Inground Heated Concrete Tiled Pool - 25ft x 12ft and 3ft 4" to 6ft 6" deep - 45k Litre Water Capacity
    Valve - Hayward Vari-flo 711-13 ------ Pump - Sta-Rite 5P1R
    Filter - Hayward S244T -------- Test Kit - Taylor K2006C

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