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Thread: we need to increase calcium hardness

  1. Back To Top    #1

    Join Date
    May 2016
    Memphis TN

    we need to increase calcium hardness

    I took our pool water to the pool store and they said we needed to add calcium as it was low which it what it also showed on our test strip. We have a gunite pool. They recommend adding 56lbs. It there somewhere to buy this cheaper than the pool store. They want $75 for 45lbs. Our water is also slightly cloudy but all the other chemicals appear to be correct. I'm guessing we need to change the sand in our filter. Has anyone changed the sand themselves. Our pool guy said there is a synthetic medium that works better not sure what it is. We just recently had a UV system installed so that we would be exposed to fewer chemicals. Thanks

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    Mod Squad YippeeSkippy's Avatar
    Join Date
    Jan 2012
    'burbs of Augusta, Georgia

    Re: we need to increase calcium hardness

    Welcome to TFP Lpaulk

    To cut to the chase, we do NOT generally trust Pool Store tests nor "Guess strips". They're too unpredictable as well as can vary in results even from the same sample. We encourage you to get a good test kit- The TF-100 is preferred by many and can be had off Amazon or
    Along with a Taylor K-1766 Salt test, you can keep closer eye on your chemistry levels.

    You can buy pool sand (it must specifically say "pool sand") at Lowes or HomeDepot, but in truth sand *rarely* requires changing. The rare time it does if it has been gummed up with bacqucil or a couple other odd chemicals we don't recommend. You can perform a deep cleaning on it. Directions can be found in the Pool School articles up at the top of this site.

    I'd suggest reading Pool School and holler back with any questions, 'k?
    Maddie :) 12K Fiberglass IG, Infinity 4000 automatic cover, SWCG, Hayward Sand Filter, Hayward 1.5 Pump, Doheny Discovery Robot, Savi Melody LED pool lights, outdoor speakers and other assorted doo-dads. Sundance Altamar Hot Tub.
    Our pool build--> Our Pool Solved Our Sloping Yard Skippy's Cheap Pool Cooler -->Skippy's New Fountain

  3. Back To Top    #3

    Join Date
    Apr 2013
    Sacramento, CA

    Re: we need to increase calcium hardness

    Welcome to TFP !!!!

    Why don't you post the test results from the pool store and we can look at that.

    As a general rule we are suspicious of pool store recommendations. We generally advise doing your own testing and avoiding the pool store.

    Cloudy water is not caused by low calcium. Its caused by organic matter or something else suspended in the pool. Like algae.

    Test results would help.

    We would recommend purchasing calcum chloride deicer at Home Depot or Lowes. Calcium hardness can be raised with calcium chloride or calcium chloride dihydrate. They are available in some areas as Peladow, Dowflake, Tetra Flake, or Tetra 94, often sold as a deicer by hardware stores, and some big box stores, in colder climates. Pool stores will carry either calcium chloride or calcium chloride dihydrate under a variety of names, including Hardness Plus, Balance Pak 300, Calcium Hardness Increaser, etc. Calcium products should be spread across the surface of the deep end of the pool.

    But post the test results first i have my doubts you need it.

    Backwashing and deep cleaning the filter help. Changing the sand is just a way to get you to purchase expensive sand. Its just sand. Here is a great thread on deep cleaning your sand filter: Deep Cleaning a Sand Filter

    There are alternative mediums to sand. But to tell the truth of the thousands of post Ive read and responded to on here -- I can't tell you it makes a difference.

    UV --- It has its place but probably wont reduce your chlorine exposure over the long run. Why because you need to keep the same amount of chlorine in the pool to sanitize whether there is a UV system in place or not. UV only deals with the water that passes through it. Therefore the rest of the pool must be kept at minimum sanitation levels because the UV is not working there.

    Also the sun does a great job providing your pool with high levels of UV. That's what is actually doing most of the UV work on organics in your pool the UV from the Sun. High bather load in the pool, indoor pool yes both probably need UV. Ordinary residential pool, doubt its going to make much difference.

    Post some test results and lets look at your calcium hardness issue.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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