Make your own swimspa?

Discussion in 'Home Repair' started by Jim Elbrecht, Aug 19, 2008.

  1. Jim Elbrecht

    Jim Elbrecht Guest

    I keep seeing free hot tubs on craigslist and wonder if I can put a
    couple to work.

    I'm considering building an in ground, concrete swimspa next spring.
    Can the pumps, bubblers & fittings be adapted for use in a concrete
    enclosure? Will a pump- or 2- provide enough water flow to swim

    Has anyone here ever built a concrete tub? I'm considering an 8x15
    footer- maybe 5' deep? 4?

    I'm still in the head-scratching and envisioning stage. Welcome all
    comments, criticism, or advice.

    Jim Elbrecht, Aug 19, 2008
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  2. Jim Elbrecht

    trader4 Guest

    In the grand scheme of things, I don't know see that you're saving
    much to justify trying to salvage parts from free spas or how they can
    be adapted to a concrete spa. For example, in my spa, the air
    bubbler is nothing more than an air blower that forces air through
    hose and a passageway and out holes in the fiberglass spa bottom.
    How you would adapt or make that out of concrete, I have no idea. I
    guess the water jet portion could be fitted into openings in the
    poured concrete, but then you have the little details like the air for
    the jets is controlled by a valve device that controls the amount of
    air that can enter. That is built into the top of the spa where you
    can reach and turn it. How and where do you mount that in the new
    arrangement? Another issue would be the heater. The spas you're
    talking about have heaters that put out about 6KW. I would expect
    that concrete spas, because of size and thermal issues would require
    larger gas heaters. It would seem to me that to get anywhere near
    decent results you need a whole lot of experience and the right
    parts. Why not just get a regular spa?

     Will a pump- or 2- provide enough water flow to swim
    Oh, maybe this is why.

    Sure, it will, if it's big enough. But the pumps in the typical spa
    do not move any where near that much water. They blast water out of
    jets and use 2" piping, which gives you a soothing jet of water, not a
    river current. To move enough water so that you can swim in place
    requires far more water than any of these pumps can supply. Though
    not popular, some people do have these types of pool.
    trader4, Aug 20, 2008
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  3. Jim Elbrecht

    Reno Guest

    Funny you should ask - I have just such a pool almost completed in the
    basement of my new house. The size is 8' x 14' by 5' and the water will
    be 4.5' deep. The concrete work was done just after the basement walls
    were poured. The jets, intakes, light housing and skimmer were cast into
    the concrete. The pool itself is painted and the I am in the process of
    designing the pump and other mechanical system.

    My preliminary design was for a 400 gpm pump for maximum current speed
    but the pump will be variable speed so I can have a nice slow speed for
    aquacize. The jets came with 1.0" diameter orifices and I also bought a
    set of 0.925" orifces so I can experiment.

    Since the pool is in the house I do not want any chlorine smell at all
    and have investigated the options for disinfection.

    It has been a lot of work researching and designing the varius systems. I
    will be getting help from some industrial engineers to design the control

    I would be happy to discuss my work with you but I don't want to use my
    email address on the public group. I'll try your address to see if it
    Reno, Sep 4, 2008
  4. Jim Elbrecht

    nigel Guest

    Just wondering how your swimspa plans are coming? I would like to form a similar sized concrete swimspa in the spring. I have 3 pumps / hot tub valvesand some larger to start with. It seems you guys had it pretty well figured so any advice would be appreciated, regards Nigel.
    nigel, Sep 29, 2013
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