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Thread: Clear Ocean Water

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    Clear Ocean Water

    Not sure if this is the right forum, but how is it that ocean water in some parts of the world is clear and you can see to the bottom? How would the chemistry makeup register on a pool test kit? I'm assuming the chlorine would have to be at zero, yet no algae is present.
    11000 gallon Viking Fiberglass 12 x 28, Intellichlor IC-40 SWG, 24" cascade fountain, 12" cascade fountain, 1 1/2 HP pump, sand filter

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Clear Ocean Water

    There is always algae, just not very much. Usually that is because there isn't anything for the algae to eat.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Join Date
    Aug 2009
    North Central Texas

    Re: Clear Ocean Water

    How about a few people, going on tropical vacations, take a testing kit.

    Inland lakes occasionally become over populated with algae, due to many different reason, but frequently because of pollutants, "over feeding" the algae.

    Frequently, the visibility of ocean water has to do with weather conditions and how much bottom sand/silt is being stirred up by the ocean tides, currents, waves, etc. So turbidity of water is not necessarily due to the presence of algae.

    In healthy bodies of water there is a balance of organisms that keep the algae in check. Without algae, though, the oceans would probably die, beginning at the bottom of the food chain, where the smaller animals consume only algae. Larger consume those and then on up.

    1981, 25K, IG, Blue Plaster 1996, somewhat oval, widens a bit at shallow end, 1.5" pipes, 2" at Pad, 1 separate main drain, 1 skimmer, 4 returns + dedicated cleaner return, 10 ft deep end with very fast decline from shallow, Pentair Quad 80 DE, Pentair Intelliflo VF, 3/4 HP Booster Pump (equipment pad about 8 ft below top of pool), Challanger 3/4 Trash/Emergency Pump 120v, Polaris 280 (pressure), iRobot Verro cleaner (robotic), Aquabot Turbo (robotic), Jacuzzi Tracker 4X (vacuum) Pool Blaster (Buster), Two (2) PoolSkims, Solar Breeze (solar powered top skimmer) (beta to ver. 2, release date 2010), ColorSplash LED replacement bulb. Aries 550 gal separate spa, 2002 (our 3rd and BEST spa) , BBB-Bromine

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Clear Ocean Water

    See this link for example (it has several interesting links within that article). Take even "clear" ocean water (or fresh water) and look under a microscope and you'll be amazed at what you see. It takes quite a lot of algae to grow before it becomes visible as dull or cloudy water. This is why you will usually see a higher-than-normal chlorine demand before you see the water become less clear.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    poolgirl22's Avatar
    Join Date
    Apr 2010
    Stephens City, VA

    Re: Clear Ocean Water

    Quote Originally Posted by geekgranny
    How about a few people, going on tropical vacations, take a testing kit.

    Ok. I'll cover Cozumel end of July. As well as the cruise ship pool and kid soup pot (hot tub).

    Incidentally, I've always enjoyed the ocean. For some reason it's natural way has never led me to feel as unsanitary or heebie jeebied out like some lakes do. And, lakes like Erie, Michigan, and other larger systems don't seem as icky as the smaller stripper pit type (gravel pits).

    The exception is if the shoreline LOOKS polluted with foam, scum, OIL, etc.
    Backyard pool-less, but used to be.....
    16,100 gallon, 18x38 3.5 ft deep oval AG, Vinyl, Sand, 1hp pump Liquidator TFT100 test kit

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    guamguy's Avatar
    Join Date
    Feb 2010
    Guam, USA

    Re: Clear Ocean Water

    OK, I'll bite I live on the tropical island of Guam, and the water (the ocean and our pool ) is VERY clear. Tomorrow morning when I head out diving, I'll grab a sample before I come home and post the results.

    PS... For all you divers out there, visibility at most of Guam's dive sites is usually 50-100+ ft.
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
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