Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: A use for your old SWG Cell

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    A use for your old SWG Cell

    Most of us do not have the luxury of bypassing our SWG cell when shocking the pool with chlorine, especially at high levels.

    I believe most manufacturers recommend that one does not operate the SWG cell with high levels of chlorine as it can damage the cell, or shorten its life. If then when you replace your cell you keep the old one it can be used when doing any kind of shock treatment with liquid chlorine, saving your new or current cell.

    If someone already wrote on this please excuse me, but I thought it might be useful.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

  2. Back To Top    #2

    Join Date
    Dec 2009
    Location
    Central Massachusetts
    Posts
    2,690

    Re: A use for your old SWG Cell

    I've never heard that. What manufacturer recommends it?
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

  3. Back To Top    #3

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Re: A use for your old SWG Cell

    bk406,

    "Excessively high chlorine levels can cause premature cell failure and corrosion
    damage to pool fixtures and equipment"

    Pool Pilot Digital Manual, page 24

    Aloha.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

  4. Back To Top    #4

    Join Date
    Dec 2009
    Location
    Central Massachusetts
    Posts
    2,690

    Re: A use for your old SWG Cell

    I wouldnt worry about it, really. How much do you shock and for how long?
    14,000 gallon IG, Vinyl. Hayward 3/4 hp superpump, Penatair IC40 SWCG, Pentair automation, Hayward sand filter, Aqua Comfort heat pump, Hayward 400k Lo-Nox LP heater.

  5. Back To Top    #5

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Re: A use for your old SWG Cell

    bk406,

    Recently, shocked for nearly a week recently but that was due to unusual demand.

    Do not shock very often otherwise, but for those that have an excess algae problem it could be useful if they shock for more than a few days.

    I would imagine that Pool Pilot and maybe others have their reasons for making this statement.

    Anyway it cannot hurt, and as they say better safe than sorry, and it costs nothing, unless you get a credit on your old unit.

    Aloha
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

  6. Back To Top    #6
    sonflower's Avatar
    Join Date
    Jun 2010
    Location
    Fort Worth, TX
    Posts
    157

    Re: A use for your old SWG Cell

    I knew high SALT would damage the salt cell but not high chlorine. What is "high" chlorine.... > 5? > 10? > 20?
    Pool: (2003) IG Plaster 14,209 gallon (Water Surface 421 sq. ft.) ~ Spa: 18" raised kidney
    Triple spillway (Waterfall) ~ With 6' slide ~ Hayward's Goldline Controls Aqua Rite Digital Electronic Chlorine Generator (Salt System) ~ 40K Salt Cell ~
    ~ AquaLink RS -4 ~ Purex Whisper Flow 2 HP~ Aquatech 60 sq. ft. DE Filter Normal Pressure 22 # ~ MiniMax NT (Propane) Heater 400,000 BTU ~ Jandy Valve Actuator ~Letro Legend Cleaner ~ K-2006 & K-1766 Test Kits

  7. Back To Top    #7

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

    Re: A use for your old SWG Cell

    It makes absolutely no sense that high chlorine levels would shorten cell life. Saltwater chlorine generators GENERATE extremely high levels of chlorine that then dissolves in water to drop the pH significantly so the active chlorine level near the chlorine generation plate is extremely high. The plates have to have coatings that resist corrosion from such very high chlorine levels. Manufacturers have stated that between the plates the chlorine level has been measured at 80 ppm FC so would be even higher very close to the chlorine generation plate.

    Also remember that even the shock level recommended on this forum where the FC is around 40% of the CYA level is equivalent to only around 0.6 ppm FC with no CYA. Because of CYA in the water, the active chlorine level never gets very high. Even at high shock levels, it is almost always lower than typical indoor pools at 1-2 ppm FC that have no CYA. At yellow/mustard algae shock levels with an FC that is 60% of the CYA level, this is equivalent to around 1.4 ppm FC with no CYA.

    (I edited this post and added the following as Jason wrote his post -- we're saying the same thing)

    As for the Pool Pilot manual quote, they are referring to the fact that getting to very high chlorine levels means your SWG on-time is too high and of course that reduces its life. They are also referring to the fact that if the active chlorine levels gets very high that this can accelerate metal corrosion, but that is much more likely in a pool with no CYA such as many indoor pools where a runaway SWG could raise the FC to well above 5 or 10 ppm FC with no CYA which would be more harmful to pool equipment in the long-run -- some pools that aren't monitored get to 20 ppm FC or more. Again, with CYA in the pools we have far less likelihood of having problems, plus pool owners test their chlorine levels to make sure that the SWG doesn't run without adult supervision, so to speak.
    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"

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: A use for your old SWG Cell

    I can imagine a situation in an indoor pool, should the FC level got into the 30s and CYA was zero, that could cause various kinds of damage. In an outdoor pool with CYA in the water, it doesn't seem plausible that there could ever be a problem.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  9. Back To Top    #9

    Join Date
    Aug 2008
    Location
    Honolulu
    Posts
    429

    Re: A use for your old SWG Cell

    Maybe the representative from Pool Pilot, Poosean - Sean Assam is his name I believe, could illuminate us on what parameters Pool Pilot are using to issue this warning.

    Although everything you both wrote makes sense, especially the part about 80 ppm.

    Thank you.
    10,000 gal plaster pool,3/4 hp WhisperFlo pump, Sta-Rite Great White GW9500 pool cleaner, Hayward 300 lb Sand Filter
    Use Magenta Stuff for Iron and Silica control.
    Balance: pH 7.7 Cl 7 -8 Alk 70-80 CH 325 CyA 30 in winter - 50 in summer NaCl 1010 TDS 1200

Posting Permissions

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