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Thread: TF-100 is so sensitive, I realized my circulation is poor

  1. Back To Top    #1

    Join Date
    Apr 2008
    Location
    Indonesia
    Posts
    311

    TF-100 is so sensitive, I realized my circulation is poor

    Guys,

    I am very very pleased with TF-100 test kit....
    Its the best money I ever spent for my pool. Its worth the wait of 3 months, since I ship it with my other goods from USA.

    Anyhow what I learnt is that because my pool is so deep at 13 feet about 60% of its length, immediate drop off from 4 feet to 13 feet somewhere close to the middle that is.... and the inlet nozzles...6 of them are located about 1 feet from surface and having only 1 main drain at the bottom and deep end of the pool....I get different FC reading from different corners of the pool. Bottom line is that, my pool water circulation is worse than I thought !!!

    The pump will suck water from an overflow tank and from the main drain. The overflow tank is also a balancing tank. The pool is always over filled with water so that overflow will occur and the top water layer will move out of the pool to carry all floating dust & the like. It will then flow to the gutter which is all around the pool and eventually will flow into the overflow/balancing tank.

    I have set all my inlet nozzles to point as low as possible but that does not do much help for better circulation. If I know any better, I would have the inlet nozzles located much deeper if not at the bottom scattered around. The overflow/balancing tank is sized to also to handle at least 250 gallons of water being displaced by swimmers. The good thing of having this tank is that the pool have no scum line, because its always overfilled. The tank instead gets the scum line, since on average its only 1/3 full when there are no swimmers. The tank is also good to "catch" the oil from suntan lotion or whatever body oil swimmers produce. On the downside, the gutter waterflow falling into the tank resembles a waterfall and aeration happens, thus I need to add 1 liter ( apporx 1.1 quart ) 31% Muriatic Acid ever week or so to lower the PH.

    I also think due to the partial sunlight shining on my pool, it may cause different FC consumption on different part of the pool. Part of the pool is in constant shade, covered by my building.

    I am getting up to 1 ppm FC difference ( higher ) reading between one side of the pool where the inlet nozzles are slow/weak due to being on the longer pipe run, compared to the pool side with good water flow.

    I notice the same thing happening to my friend's pool where the kids pool joins the bigger pool and water flow is slower at the kids pool. There is 0.5PPM higher FC on the kids pool.

    Do you guys here ever test your pool water at different spots just to check if the FC are well distributed ?
    With the OTO, I can't tell 0.5PPM difference in yellow shade of color.

    My logics tell me that if I can't distribute my FC or sanitation as well/fast as other common shape/depth pool, that means my filtration will need more pump run time to get a 100% true water filtration...meaning my pool water clarity stability against high bather load will suffer.

    I am beggining to hate my PB more and more...

    Regards,
    SPP
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

  2. Back To Top    #2

    Join Date
    Dec 2007
    Location
    Central New York
    Posts
    504

    Re: TF-100 is so sensitive, I realized my circulation is poor

    SPP ... Is it possible to screw in a 90 deg PVC fitting in one or two of your pool inlets instead of the inlet nozzles you now have? If they would fit, you could then move the fitting around it get better water movement.
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

  3. Back To Top    #3

    Join Date
    Apr 2008
    Location
    Indonesia
    Posts
    311

    Re: TF-100 is so sensitive, I realized my circulation is poor

    Hi Hotrod,

    I will take a look at that...thanks. I know its threaded on the outside ( OD ) when I remove to play and adjust the middle part to aim the water down. All PVC piping kits in my country is for glue-on application, let me look around if the HDPE pipe kits are different since they use compression fittings, not glue.

    I was tempted at one gadget that does this 90* degrees turn and it has a wheel to create sort of turbulence, I think its called Cirulator or something but its like US$90 and I will need to use at least 3 units, that is number of inlet nozzles at the deep end.

    If that PVC fitting can work, I might as well hook it up with a hose and send it down to the bottom of the pool.... , as long as resistance doesn't add up much. My PB screw up the pool by using 1.5" pipes all around for suction and all discharge. I am now getting something like 50 feet of total head equivalent as it is...I am very sad and pi$$ed. I am getting only 50 GPM of water flow from a 2 HP Hayward. My pump is a 50hz model, so its flow & head capability is lower than USA type 60hz.

    So my PB used a 60hz pump curve for my 50hz motor and plumb it with 1.5" instead of 2" pipes. Now I pay extra resistance of about 8psi due to undersized pipe or I loose at least 10 GPM of flow just because of that...

    I am getting a slow 12 hours per turnover, instead of the common 8 hours design goal that my PB assumed.
    That is why I bought that extra 1.5HP Pentair pump on trolley....which is easily 80 GPM.
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

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