Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 14 of 14

Thread: AquaPilot SC-48 can't keep up with FC demand

  1. Back To Top    #1

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    AquaPilot SC-48 can't keep up with FC demand

    I opened the pool about 2 1/2 weeks ago when the water temp was about 50 F. The water was clear, but just a tad cloudy in the deep end so I shocked and ran the pump 24/7 for the first four days. The water cleared and had a successful overnight FC test (no loss). I then adjusted CYA to about 75. Problem is the SWG cannot seem to keep up with demand. Depending on the day we are losing between 1 to 2 ppm. I'm running the SWG 8 hours at 100% of the highest power level (3) and during these losses I am not running the heater or auto pool cleaner. We have had a ton of pollen so I did another overnight FC test last night and did not lose any FC. Last night there was a trace of CC (less than .5 ppm) but that was gone this morning. In testing FC/CC over the last couple weeks there IS at times CC of .5ppm or less but I figured that might be due to solar cover, pollen etc.

    Numbers this morning:
    FC: 3.5
    CC: 0.0
    TC: 3.5
    pH: 7.5
    T/A: 90
    CH: 180
    CYA: 75
    Salt: 3500 @ SWG unit 3200 w/AquaCheck Strips.
    Temp: 78F

    Any ideas? Do I need to run the pump/SWG an extra couple hours? In the past we've run 8 hours at 50% of power level 2. This is just the third season for the unit and there is no scale build-up etc. I'm stumped
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  2. Back To Top    #2
    Guest

    Re: SWG can't keep up with FC demand

    Hence the "problem" of the SWCG! Sounds like you may need to supplement with bleach.

    I'm not gonna lie; I'm not a SWCG fan, and mostly because they are oversold ("Just put this in and set it and forget it. You'll never have to add chlorine again, and it will make all you need"). I've had three different units, and they have all worked. However, I've either had to run the pump longer than normal to keep up production levels or clean the grid plates too often for my liking.

    If your pool requires more chlorine than the SWCG can provide, then you will either need to run the pump longer (which will cost you extra electricity) or add liquid. There is nothing wrong with having to add bleach, although it is kind of frustrating after having a SWCG installed and expecting it to keep up with demand!

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: SWG can't keep up with FC demand

    A PoolPilot SC48 should be able to keep up with that pool very easily, especially with the water relatively cold. Given that you have already ruled out many of the common causes, there is most likely a problem with the SWG. Could you temporarily put the unit in boost mode, wait five minutes, do a Test PoolPilot, and tell us the amps and volts it reports? After doing that you can turn off boost. Also, do a visual inspection of the cell plates and make sure there isn't any white chalky residue on the plates and no accumulation of any other obvious debris.
    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

  4. Back To Top    #4
    Guest

    Re: SWG can't keep up with FC demand

    One of the units I ran was the SC60. Great unit when it worked, but too much "down time" for my liking. My pool is roughly the same size as andrewg's, and I run mine for 8 hours a day, every day.

    I'm on BBB now, and loving it! I know what is in my pool, because I have added it (via a Liquidator, but I can still see what I have and test/add as needed)! SWCG are great conveniences, but they are not without the constant need of awareness as to if they are producing chlorine or not. Just like anything that is a convenience, they require attention and tweaking. If you like tweaking with stuff (I have no more vehicles with carburetors, for example! I got sick of tweaking them to make things run right!), then a SWCG may be for you! You just have to set your expectations accordingly!

  5. Back To Top    #5

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: SWG can't keep up with FC demand

    Quote Originally Posted by JasonLion
    Could you temporarily put the unit in boost mode, wait five minutes, do a Test PoolPilot, and tell us the amps and volts it reports? After doing that you can turn off boost. Also, do a visual inspection of the cell plates and make sure there isn't any white chalky residue on the plates and no accumulation of any other obvious debris.
    Thanks Jason. I'll run the test when I'm back home. The plates were clean at start up about 2 1/2 weeks ago. Is this something that could have built up over that time period?

    Quote Originally Posted by simicrintz
    There is nothing wrong with having to add bleach, although it is kind of frustrating after having a SWCG installed and expecting it to keep up with demand!
    I have always added bleach at times, for shocking or when I knew my settings wouldn't keep up due to bathing load CYA etc, but I hope it doesn't become a daily thing.

    I'll run the power test later today.
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  6. Back To Top    #6

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: SWG can't keep up with FC demand

    While in Boost Mode, the Test shows 29 Volts - 6.1 Amps. There doesn't seem to be any chalky residue or buildup on the cell plates. Looks pretty clean.
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: SWG can't keep up with FC demand

    29 volts and 6.1 amps suggests that the cell is getting older, running at about 92% of ideal. That fits with this being it's third season, but doesn't really account for what you are seeing.

    Is there any chance that your CYA level is actually a fair bit lower than you think it is?
    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

  8. Back To Top    #8

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: SWG can't keep up with FC demand

    Well, I always have trouble trusting my eyes with the CYA test, but I'm pretty sure it's between 70 and 80. I had two other people confirm on two different tests. I think I am going to do a reverse-FC hold test tonight, ie run the pump/SWG all night and see what happens. That would probably be a more controlled setting to guage how much chlorine is actually being produced.
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  9. Back To Top    #9

    Join Date
    Apr 2007
    Location
    Ft Lauderdale, Florida
    Posts
    1,455

    Re: AquaPilot SC-48 can't keep up with FC demand

    Andrew, what % are you currently running? When you look at the cell blades, do the two outer blades appear to be shorter than the blades between them? This would appear as if the edges of the outer blades are eroding.
    It is possible for the cell to scale up quickly, especially if you've added any alkalinity plus, or calcium chloride or calcium hypochlorite to the pool.

    Give it a mild acid wash (4 to 1). Then run a TEST POOL PILOT again.
    Sean Assam - Sean@teamhorner.com
    National Accounts and Commercial Products Manager
    AquaCal Heat Pumps www.aquacal.com
    AutoPilot Salt Chlorine Generators www.autopilot.com

  10. Back To Top    #10

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: AquaPilot SC-48 can't keep up with FC demand

    OK, I ran the pump/SWG for 12 hrs from 7pm to 7am @ 100% power setting 3 and the FC went up 1.5ppm (from 5.5 to 7.0)
    Quote Originally Posted by Poolsean
    When you look at the cell blades, do the two outer blades appear to be shorter than the blades between them? This would appear as if the edges of the outer blades are eroding. It is possible for the cell to scale up quickly, especially if you've added any alkalinity plus, or calcium chloride or calcium hypochlorite to the pool. Give it a mild acid wash (4 to 1). Then run a TEST POOL PILOT again.
    I pulled the cell yesterday afternoon and did notice a very slight hint of erosion on the outer plates, not much at all and I don't think I could quantify it but obviously it was visible to the naked eye. At that time the blades were smooth. I am assuming (maybe incorrectly) that you can you actually see the scale buildup? I'll try to grab some MA today for the wash and I think I will try another overnight FC-hold test as I am not 100% sure this is still not an organic situation.
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  11. Back To Top    #11

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: AquaPilot SC-48 can't keep up with FC demand

    OK...so last night FC did NOT hold. Dropped 1ppm from 5 to 4. Can pollen create this sort of demand?
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  12. Back To Top    #12
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: AquaPilot SC-48 can't keep up with FC demand

    Pollen can use a little FC, but pollen alone using up 1.0 of FC overnight is very unusual.
    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

  13. Back To Top    #13

    Join Date
    Aug 2008
    Location
    Southwest New Hampshire
    Posts
    52

    Re: AquaPilot SC-48 can't keep up with FC demand

    Quote Originally Posted by JasonLion
    Pollen can use a little FC, but pollen alone using up 1.0 of FC overnight is very unusual.
    Looks like it's shock therapy 'til I get rid of whatever the chlorine be munching on...
    Andrew
    25,000 gal IG Vinyl - PoolPilot SC48 SWG - Sta-Rite 1HP/System3 CF - AquaCal HeatPump - TF-100

  14. Back To Top    #14

    Join Date
    Apr 2007
    Location
    Ft Lauderdale, Florida
    Posts
    1,455

    Re: AquaPilot SC-48 can't keep up with FC demand

    Amen
    Sean Assam - Sean@teamhorner.com
    National Accounts and Commercial Products Manager
    AquaCal Heat Pumps www.aquacal.com
    AutoPilot Salt Chlorine Generators www.autopilot.com

Posting Permissions

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