Crack•Stix® – The ONLY permanent concrete or asphalt crack & joint filler.

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Pool Decks!

Most caulks used in concrete pool joints are NOT chlorine resistant...but Crack Stix is!
  It is important to remember that it's not just your pool and pool deck that need to be maintained but the joints do as well! From both a safety and an aesthetic standpoint… http://crackstix.com/blog/2015/02/pool-decks/

Filling Deep Concrete Joints & Cracks

Don't forget that deep cracks and joints need one extra step of preparation: backfilling! You can use a 'hot' backer rod or sand ... read more for details.
    For concrete joints and cracks deeper than 1/2" we recommend filling that gap with stone dust or sand first -- leaving 1/2"exposed for the product.  You can also us… http://crackstix.com/blog/2015/02/filling-large-concrete-joints/