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Thread: Cooler Weather, FC - 3 days no change?

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    Sunbaby's Avatar
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    Question Cooler Weather, FC - 3 days no change?

    Hey guys - it has been a while since I have posted (which in pool land means all is well). I have been on bleach for a while - everything going great. It has gotten chilly here in TX - my pool water is at 60 degrees - right now it is 55 out. Up until this past week - I have been adding 30-35 ounces of Bleach a day. (I test, use pool math, but this is the norm). The past 3 days - my FC has remained at 9 - I haven't added anything. I know it slows during the colder months - but could this be right? Everything else is testing fine according to pool math - all within range.

    I am just worried that maybe I am missing something??
    ~Wendy
    33'X17' Sports Pool (3'6"-5'-4'6") 7' flush Spa, Blue Granite PT, Waterfalls, Weeping Wall, Baja Ledge and Doggie Beach Entry! Pentair Clean and Clear 420, IntelliFlo XF Pump, SuperFlo 1.5 HP Feature Pump, MasterTemp Heater, Pal-Treo LEDs, Dolphin M4, Liquid Chlorine & TF-100 - My Build Thread

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    Divin Dave's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    It sounds about right Wendy. Wont be long, and it will stretch out every couple of weeks before having to add some.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    borjis's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    yep that time of year...my water is now at 42 and soon it won't need any bleach added to maintain until spring.

    my last pool needed nothing added from Dec until mid march.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Sunbaby's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    Wow! Gonna save some $$$$! Yay!
    ~Wendy
    33'X17' Sports Pool (3'6"-5'-4'6") 7' flush Spa, Blue Granite PT, Waterfalls, Weeping Wall, Baja Ledge and Doggie Beach Entry! Pentair Clean and Clear 420, IntelliFlo XF Pump, SuperFlo 1.5 HP Feature Pump, MasterTemp Heater, Pal-Treo LEDs, Dolphin M4, Liquid Chlorine & TF-100 - My Build Thread

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    Jaimslaw's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    I've dialed my SWG back to 15% and FC still drifting up, so will back it down to 5%. Water temp at 59 degrees and falling.

    My first winter, I didn't know any better and kept the SWG at my usual 50%...saw my FC inexplicably rise practically to SLAM levels until I realized the cold water and short daylight hours impact on pool chlorine consumption. Turned off the SWG - it wasn't until the spring that my FC got back down to normal levels.
    Pool: 13k gal. in-ground; Stonescape Mini Pebble - Tropics Blue; Connected Spa - dual spill-over; Aqua Rite T-15 SWCG; AquaLogic PS-4 Automation; Sta-Rite DE Filter; Sta-Rite Max-e-Therm 400k BTU pool heater; Intellifo 2-VST Pump; Stenner 45mp2(25psi/10gpd) acid injection; Bulbwizard color LED pool lights; Poolvergnuegen 2 wheel side suction cleaner; FAFCO rooftop solar. TF-100 w/ speed stir.

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    Re: Cooler Weather, FC - 3 days no change?

    I'm in Kingwood Texas about 30 min away from you in Conroe and I'm going through 27 ounces every day with a 19K pool. And I have been for the past month. I have been testing daily too.
    40x15 IG, 19,000 gallons, Taylor K-2006C, Intellichlor IC40, Pentiar 1.5 hp Intelliflo VS, Pentair 420 Clean/Clear Filter, Speedstir, Stonescape - french grey, Travertine Paver decking, Completed August 1, 2015.

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    Re: Cooler Weather, FC - 3 days no change?

    I find I test more often in the winter than the summer for this reason. Can't be sure the FC is dropping very much. In the summer it's just 32 a day.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    Sunbaby's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    Sooo weird! I'm at 8 today. But haven't added bleach. I keep thinking what if my chemicals are bad but my water looks perfect.
    ~Wendy
    33'X17' Sports Pool (3'6"-5'-4'6") 7' flush Spa, Blue Granite PT, Waterfalls, Weeping Wall, Baja Ledge and Doggie Beach Entry! Pentair Clean and Clear 420, IntelliFlo XF Pump, SuperFlo 1.5 HP Feature Pump, MasterTemp Heater, Pal-Treo LEDs, Dolphin M4, Liquid Chlorine & TF-100 - My Build Thread

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    Re: Cooler Weather, FC - 3 days no change?

    still trying to figure out all the numbers. Tested pool yesterday, water 46 , fc 1.58 total chlorine 2.13, combined 0.55, ph 7.4, hardness 540 which seems very high, cya45 swg has been removed for one month now. using a chlorine floater with large disks alk 87 should I be worried tried pool math yesterday but was confusing to me
    pool 11-14,IG 16,500G 4ft to 6ft Quartz Tahoe Blue Pentair equip VS pump cartridge filter IC40 SWG Heat Pump Hayward Shark XL Robotic Eagle Point, Or

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    Re: Cooler Weather, FC - 3 days no change?

    If your fc is 1.5 and your stabilizer 45 you are at risk of algae. Not sure what kit you are using to get ppm readings to the hundredths. At the bottom of pool math, set your reference for trouble-free.com, put your test results in the left column for all readings. If your results are not at or near the recommended levels, the section to the right tells you what to do.

    But you should start in poolschool at the top of these pages, and get a recommended kit.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    espejo's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    Sunbaby, and despite my post a couple of days ago I too am noticing that my FC is holding. I'm down to just adding a little less than 13 ounces each day. I have a Stenner hooked up to my ET8 so I'm just making the adjustment in my schedule. Once it stabilizes for more I will probably unhook the Stenner and bring it in and just to a week chlorine dosage.
    40x15 IG, 19,000 gallons, Taylor K-2006C, Intellichlor IC40, Pentiar 1.5 hp Intelliflo VS, Pentair 420 Clean/Clear Filter, Speedstir, Stonescape - french grey, Travertine Paver decking, Completed August 1, 2015.

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    Re: Cooler Weather, FC - 3 days no change?

    ok, Thank you, will try pool math again. I was using a Lamotte colorq7
    pool 11-14,IG 16,500G 4ft to 6ft Quartz Tahoe Blue Pentair equip VS pump cartridge filter IC40 SWG Heat Pump Hayward Shark XL Robotic Eagle Point, Or

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    Re: Cooler Weather, FC - 3 days no change?

    Paulette, please start your own new thread. We get confused when you post results on someone else's thread. We want to help, but we need to help the original poster here. Thanks!

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    Re: Cooler Weather, FC - 3 days no change?

    Quote Originally Posted by borjis View Post
    yep that time of year...my water is now at 42 and soon it won't need any bleach added to maintain until spring.

    my last pool needed nothing added from Dec until mid march.
    Won't you still lose some to the sun?

    My temperature dropped from 60F to 50F this week and that's about as low as it goes here and I still lost 1.5/2ppm in 6 days. I get sun pretty much all year round so I'd imagine I'm looking at that sort of ppm loss until spring (but maybe I need to give it another week or two of solid 50F to be sure). How are you able to avoid the sun eating up your chlorine if you don't have a cover? This is my first TFP Winter/Spring so I'm curious to see what my chlorine costs will be.
    I'm a Brit abroad living in Northern Spain near Barcelona.
    In Ground Plaster 15,500 US gallons.
    Certikin Sand filter (SPHS640) with 0.6mm -1.2mm glass media.
    Astralpool Victoria Plus 38774. 16,000 l/h 0.76 kW (1 HP) 230/400 V III
    LaMotte FAS-DPD 7022-01

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    Re: Cooler Weather, FC - 3 days no change?

    I am at 55 degrees, and have added like 8 oz total in the past week and am still holding at 8.6FC. Which is the top end of my target range.

    My pool runs long ways east to west, so in the winter half of it is in the shade. at least.
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    Divin Dave's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    Yup,

    We get quite a bit less UV this time of year, even though the sun may be shining. Its the UV that eats the chlorine.

    UV is a bit lower in wintertime because we are farther away from the sun. The farther UV has to travel, the weaker it is when it gets to us. So lower UV = less FC loss. And add to that, there are all sorts of things in the atmosphere that can filter out some UV. And generally, the atmosphere is pretty active in wintertime.

    Also during warmer water temps, our FC is constantly fighiting off algae spores that multiply in our pools and that consumes some FC.
    With the colder water temps help with slowing down the FC consumption because the algae spores are much less active.
    Divin Dave,
    IG Vinyl, 15' x 30', 3 1/2' - 6' deep, Oval, ~15K gal, Intelliclor IC40, Intelliflo VS pump, Clean and Clear 420 Filter, auto-fill-disabled, Retrofit LED Color Light, Dolphin Nautilus Robot, TF100 Test Kit, Taylor K1766 Salt Test Kit, Tftestkit Pressure Gauge.
    www.tftestkits.net Experience- it's what's learned just after you needed it most !!

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    Re: Cooler Weather, FC - 3 days no change?

    I live in So Cal and my current pool temp is 50 degrees. Last July and August I was adding (via a Stenner pump) 64 Oz per day to keep my FC at 6-7. It has been pretty cool here lately (for So CAl) and my current Chlorine demand is 13 Oz to keep the same FC. Quite a difference!
    38000 Gal, IG, Plaster, 20' x 40' x 10', Attached Raised Spa, Intelliflo VS 3 HP (011018), Pentair Quad DE 60 Filter, Raypak (Rheem) 400,000 BTU (407a low Nox), Easy Touch 8 upgrade, Screenlogic 2 with wireless, IS-4 Spa Side Remote, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5g (3), Dolphin Triton Plus robot with PRO remote, Water Tech Catfish handheld vacuum for spa, TF100 with SpeedStir.

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    Re: Cooler Weather, FC - 3 days no change?

    Quote Originally Posted by Desiato View Post
    Won't you still lose some to the sun?

    My temperature dropped from 60F to 50F this week and that's about as low as it goes here and I still lost 1.5/2ppm in 6 days. I get sun pretty much all year round so I'd imagine I'm looking at that sort of ppm loss until spring (but maybe I need to give it another week or two of solid 50F to be sure). How are you able to avoid the sun eating up your chlorine if you don't have a cover? This is my first TFP Winter/Spring so I'm curious to see what my chlorine costs will be.
    I might lose just a few ppm due to sun over the ENTIRE winter, but also the way my backyard is to the south sun and the foliage blocking, I get less direct
    sun in the winter. During the winter months the sun is lower in the sky as Divin Dave said. That and gray skies over the fall/winter are much more common than sunny days.

    It get's cold here in the winter...average temp is upper 30's lower 40's....but this past (this is rare before december) week my pool surface has been frozen..about 1/4 inch thick, though the water in the skimmer is not frozen.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Re: Cooler Weather, FC - 3 days no change?

    Quote Originally Posted by Divin Dave View Post
    Yup,

    We get quite a bit less UV this time of year, even though the sun may be shining. Its the UV that eats the chlorine.

    UV is a bit lower in wintertime because we are farther away from the sun. The farther UV has to travel, the weaker it is when it gets to us. So lower UV = less FC loss. And add to that, there are all sorts of things in the atmosphere that can filter out some UV. And generally, the atmosphere is pretty active in wintertime.

    Also during warmer water temps, our FC is constantly fighiting off algae spores that multiply in our pools and that consumes some FC.
    With the colder water temps help with slowing down the FC consumption because the algae spores are much less active.
    In the Northern hemisphere we are actually closer to the sun in the winter - you aren't trying to say Texas is in the Southern Hemisphere are you The sun angle and UV index is lower in the winter due to us being tilted away from the sun.
    2015 Build Link: 15'x30' Rectangle (3'-6", 5', 4' depth) 14,000 Gallon Pool, Finish: Wet Edge Primera Stone Black Kona. TF-100 Test Kit, Dolphin DX5+S Robot, Jandy CL460 Filter, VS 2HP pump, AquaPure 1400 SWG, iAqualink2, Automatic Safety Cover. No Heater

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    bdrums's Avatar
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    Re: Cooler Weather, FC - 3 days no change?

    Quote Originally Posted by santacruzpool View Post
    In the Northern hemisphere we are actually closer to the sun in the winter - you aren't trying to say Texas is in the Southern Hemisphere are you The sun angle and UV index is lower in the winter due to us being tilted away from the sun.
    The whole earth, not just the northern hemisphere, is about 3 million miles closer to the sun in early January than in early July.

    In the winter the northern hemisphere is not getting hit by the sun as directly as we are in the summer.
    Build thread
    IG Gunite w/ spa, PebbleSheen Blue Surf, 18K gallons 500sqft
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