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Thread: Stranco/Stranrol/Siemens/USfilter Ezetrol vs System 3nx

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    Stranco/Stranrol/Siemens/USfilter Ezetrol vs System 3nx

    Hi all,

    I've just managed to acquire two Stranco Controller systems as a job lot. We only have one pool to control so providing both of them work, which one should I use for an outdoor pool in Southern England?

    The system 3nx is a pH/ORP(HRR) arrangement whereas the Ezetrol is an pH/Amperometric arrangement.

    The Ezetrol looks a lot easier to install and was much more expensive originally than the system 3nx with the advantages I have thus far read of an amperometric sensor but in the manual it states that "Do not use stabilised chlorine products, as the Ezetrol will not function correctly." Does this mean that if there is CYA in the water then it will not work or it will kill the probe? Clearly I am going to use bleach as the sanitiser but as we know it is desirable to have some CYA (currently 40) which I can add seperately.

    I am consigned to the fact that we will probably have to buy a set of new probes for whichever System we use (From what I have read they are probably dead even though they have been kept "wet" in storage) and I use a taylor test kit so I can monitor results.

    The other option is to disregard the controllers totally and just use the injection pumps that came with the controllers on a timer.

    I'd appreciate your thoughts/experiences.



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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Stranco/Stranrol/Siemens/USfilter Ezetrol vs System 3nx

    I would give the Amperometric unit a try if you don't have to buy a new probe. If you do, then I'd just use the pumps.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Join Date
    Oct 2007
    Valrico, FL

    Re: Stranco/Stranrol/Siemens/USfilter Ezetrol vs System 3nx

    More than likely the ORP will not work with 40 ppm of CYA.
    7,500 gal, IG pool, L shape 22' x 15', 1.5 hp pump, cartridge filter, AquaPlus SWG/Controller, Pebble-Tec liner.

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