Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

  1. Back To Top    #1

    Join Date
    Mar 2014
    Location
    Arroyo Grande/California
    Posts
    32

    Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

    Now that my spa has been drained and will not be filled again until winter due to the drought, I am researching how to avoid problems in the past I have had due to Cyanuric Acid (CYA). Given the choice, I would never add CYA to my spa again, as I have had to drain my spa too soon this year after 6 months, and it is not legal to fill a spa in the summer where I live.

    I have read that the reason for CYA is that the sun breaks down the Free Chlorine (FC), and the CYA reduces how fast the FC breaks down. So, would it make sense to cover the spa with a dark spa cover?

    The cost is nominal @ $50 compared to draining the spa and adding CYA, and if it saves adding FC, why not?

    The covers that look promising are "Blue/Black or Space Age" which I found on a site specializing in making solar covers. What would one recommend, to get the end result of not having to add CYA and the benefit heating the water so will take less time to bring the spa temperature up for use? BTW. Not sure if ok to add a link to the covers I am interested in.

    This ? is for a Outdoor, in ground, Glass tile spa with a waterfall.

    Thank you in advance for your advise.

  2. Back To Top    #2
    Isaac-1's Avatar
    Join Date
    May 2010
    Location
    SW Louisiana
    Posts
    6,711

    Re: Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

    CYA does more than protect against sunlight, it also provides important Chlorine buffer making the chlorine less harsh on equipment, clothing, and skin.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

  3. Back To Top    #3

    Join Date
    Mar 2014
    Location
    Arroyo Grande/California
    Posts
    32

    Re: Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

    Does the spa top reduce the use for CYA?

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

    You don't have to have the CYA (and therefore the corresponding FC) as high when the spa is covered, but the point is that you still need some CYA. I recommend 30-40 ppm. That's enough to moderate chlorine's strength but not so much as to reduce disinfection too much nor require that high an FC level. Also keep in mind that the CYA will get degraded by chlorine at a rate of around 5 ppm CYA per month assuming hot spa temperatures.
    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
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  5. Back To Top    #5
    bridgman's Avatar
    Join Date
    Mar 2014
    Location
    Bowmanville, ON Canada
    Posts
    461

    Re: Do Spa covers reduce or elimate the need for Cyanuric Acid (CYA)?

    Yeah, I would say "reduce" not "eliminate". I aim for 20-30 (although I got that from some of chem geek's really old posts and seems like it might be time to reconsider ) but end up having to run at 30 anyways since that's the lowest level I can reliably test for.
    Cedar hot tub, 680 US gallons - Snorkel wood-burning heater, canoe paddle, "offline" Intex 1000 GPH pump/filter with skimmer

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •