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Thread: Recommended target levels for rental to holidaymakers

  1. Back To Top    #1
    basilf's Avatar
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    Jun 2012
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    France
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    Recommended target levels for rental to holidaymakers

    Hello all. I have had a pool for a while but this is my first forum post. I am in France and I rent out my house to English families over the summer, usually for one or two week rents totalling about 12 - 15 weeks per season. During the season I live nearby and I check the pool every morning, usually before the guests wake up to give them as much privacy as possible. Saturday is changeover day when the guests leave at 10am and the next group arrive at 4pm. There's a lot to do on Saturdays but the first job is always to vacuum the pool so that it looks perfect for the arriving guests.

    To be honest, the pool has been a constant worry and I have never really felt on top of it. The house can take up to 12 people and there are often lots of kids. There is a shower next to the pool and I ask people to use it, but I know that most people don't. They are on holiday, they have paid a lot of money to be here, and they will darned well do as they please. One time I was here and watched as two girls plastered themselves with suntan lotion and then jumped straight in the pool. Sometimes there is a ton of beach sand in there, sometimes soil and debris from the garden. Guests vary, of course, but some of them can certainly give the pool a pretty hard time and there is nothing I can do about it.

    Luckily, the guests don't seem to notice, or don't care, if the water is a bit cloudy, so by the skin of my teeth, I have always managed to survive. It always baffled me why I found it so hard to keep the water clear. Surely this kind of usage is nothing for a commercial pool? Obviously, I was missing something big, and reading this site, I'm sure I have found it…

    The only chlorine sold for pools here is trichlor pucks. There are no pool shops near here but the supermarkets are stacked up to the rafters with more kinds of trichlor pucks than croissants … not to mention flocculants and anti-algae stuff by the pallet load. For testing, what they have here are those crappy blue box kits with OTO and phenol red. And as you know, the most common advice you find everywhere is to maintain FC at 1 - 3... Well, you can just imagine…

    My routine in the past was to have the SWG set to maintain FC at 3, and then each morning I would check it and if the FC was down or the water looked a bit cloudy I would add fast pucks to the skimmer to bring FC up quickly before the guests got up. Like I said, I got by, but you don't need to tell me it was a crappy way of doing things. I simply didn't understand the FC/CYA relationship.

    After spending several days studying this wonderful site, I have (literally) chucked out the 700 page book I bought, and I feel much more confident about the future. My CYA was at 150 so last week I drained and replaced almost half the water. CYA is now 94, but guests tend to splash a lot and I backwash between guests so it should come down to target within a few weeks. Today, the pool is crystal clear and the numbers are:

    CYA: 94
    TA: 64
    PH 7.7
    FC: 9.73
    CC: 0.41
    CH: 71
    Phosphates: 2.2
    Salt: 6100
    Temp: 80°F

    After a determined search I have found a source of 9.6% bleach - in a local garden shop, of all places, so I will not be using pucks ever again. I will use your recommended SWG levels but I guess my FC needs to be up around 9 until the CYA comes down to target? Does that sound ok, or would you suggest an even higher FC? I saw somewhere here that 20% FC/CYA would be appropriate for a commercial pool. Would you recommend that in my case?

    By the way, the water will be between about 80°F and 90°F most of the time, and I run the pump 8 hours per 24 hours when guests are here. Does that sound about right?

    Any advice will be very very very gratefully received!
    Pool: 10,500 US gallons, in ground, vinyl liner, polycarbonate cover
    Pump: Marlow J100EC 550Watts, 3,170 gallons/hour
    Sand Filter: Jupiter 14, 3,700 gallons/hour, new sand this year
    SWG: JustChlor J100SC, 6,000 ppm
    Test Kit: Certikin Exact Micro 10

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Recommended target levels for rental to holidaymakers

    How are you testing? If the CC level is correct you need to do something to lower CC.

    It is hard to judge from your description, but it sounds like usage is probably on the high side for residential/low end of commercial usage. Cloudy water is common after there have been lots of people swimming (relative to the size of the pool). For heavy usages you either want to raise the FC level towards the high end of the normal range, or if that is not enough, use something to supplement chlorine (like UV, MPS, or ozone).
    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

  3. Back To Top    #3
    basilf's Avatar
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    Jun 2012
    Location
    France
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    Re: Recommended target levels for rental to holidaymakers

    Thanks Jason. I'm using the Certikin Exact Micro 10 for all tests now. I know it's not on your preferred list but results are consistent and I'm very limited with what supplies I can get here. Hmm, looking at my records, CC has gone up over the last few days. I thought anything under 0.5 was ok?

    Sounds like I should raise my FC target to around 15?
    Pool: 10,500 US gallons, in ground, vinyl liner, polycarbonate cover
    Pump: Marlow J100EC 550Watts, 3,170 gallons/hour
    Sand Filter: Jupiter 14, 3,700 gallons/hour, new sand this year
    SWG: JustChlor J100SC, 6,000 ppm
    Test Kit: Certikin Exact Micro 10

  4. Back To Top    #4
    basilf's Avatar
    Join Date
    Jun 2012
    Location
    France
    Posts
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    Re: Recommended target levels for rental to holidaymakers

    Well I am very happy to report that for the first time in five years, I have had an entirely trouble free season. Not a single spot of algae, not a single hint of cloudiness. The pool has remained sparkling clear all summer, and it has been completely effortless.

    My big breakthrough was the realisation that the biggest problem in pool care is the pool chemical industry. And I am amazed by the number of books and websites containing information that is just completely wrong. I simply didn't realise that my CYA was too high and consequently my FC was too low.

    This year for the entire season I have used about $5 worth of Hydrochloric Acid, $10 worth of bleach, and a couple of bags of salt. My CYA is now down to 80 so maybe next year I will be able to use up some of my left-over Trichlor. Once it has gone, I will never buy that s..t again.

    Anyway, a big thank-you to Jason and all the other expert contributors. You have saved me a lot of money and a huge amount of worry.
    Pool: 10,500 US gallons, in ground, vinyl liner, polycarbonate cover
    Pump: Marlow J100EC 550Watts, 3,170 gallons/hour
    Sand Filter: Jupiter 14, 3,700 gallons/hour, new sand this year
    SWG: JustChlor J100SC, 6,000 ppm
    Test Kit: Certikin Exact Micro 10

  5. Back To Top    #5
    UnderWaterVanya's Avatar
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    Jun 2012
    Location
    Mint Hill, NC
    Posts
    2,589

    Re: Recommended target levels for rental to holidaymakers

    That is fantastic! It is nice to know this information spreads all over the world.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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