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How to clean swimming pool grout

Updated April 17, 2017

Having your own swimming pool means properly maintaining it. One of the most important facets of cleaning a pool involves the grout. Grout is very porous. Over time grout lines in pools can fill up with dirt, sand and algae to name a few. Failure to maintain correct chemical balances in your pool can result in build up algae which often settles in grout lines. Maintain the correct chemical balances in your pool as well as the grout or replacement is costly.

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  1. Test the pool's chlorine in the water to make sure it's at the proper level. Use a new test kit to acquire accurate readings. Read the enclosed chlorine testing directions and follow them carefully. Use the DPD titration test to insure a near exact reading on the amount of chlorine.

  2. Purchase chlorine tablets in bulk. Use the chlorine tablet and scrub around the water line tile. This will create a white pasty residue. Continue to remove remaining mould and dirt from the water line tile to thoroughly sanitise the grout. Throw pool water repeatedly on the tile to get rid of the paste.

  3. Scrub by hand any mildewed areas of grout with a tablet. Do this a few times since grout is very porous. Remove any remaining discolouration in the grout lines with chlorine tablets. Use rubber gloves when scrubbing to protect your hands.

  4. Use a glass bead blaster once per season to remove calcium deposits from the pool tile. Rent a small, yet high-quality portable blasting system. Use glass beads and walnut shell grit when blasting.

  5. Vacuum the pool daily and allow it to run for three hours. This will help remove the algae dirt particles so they don't once again make their way into the porous grout lines of you pool.

  6. Tip

    If after testing you feel that there's still chlorine in the water, dilute the sample with a little tap water and run the test again. Scrub the tile and grout twice per month with a grout and tile brush that can be secured to a pool pole. If you have teenagers recruit them to help with the grout cleaning. Tell them if they have time to lean they have time to clean and glean!


    Close the pool if chlorine levels are above 9 PPM and wait until they are below this level before reopening the pool.

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Things You'll Need

  • Chlorine test kit
  • Chlorine tablets
  • Rubber gloves
  • Glass bead blaster
  • Pool vacuum

About the Author

Darren Hunter is an independent writer and entertainer. His articles are featured nationally, and he also is an infommercial host. He has been featured on C-Span, NPR, The Bulletin and The Big Talker to name a few. Hunter currently writes for Demand Studios. Hunter graduated from Philadelphia University.

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