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What are water crystals?
For those of you who don't know, water crystals are used in potted plants and gardens as a way of keeping moisture in the soil. They have the ability to absorb many times their weight in water and release it to the plants as they need it. When all the water is released they return to their crystal form. They will continue to expand when watered and crystallize when dry. The technical name for these crystals is polyacrylamites, also known as superabsorbers. They are the same super absorbent material used in disposable diapers and feminine pads. Haven't you ever wandered how those disposable diapers can hold so much liquid? Now you know.
Where to find water crystals
You can find watering crystals online or at home and garden stores like Lowes and Home Depot. Two b

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    I love this instructable thank you so much

    These "crystals" also are known as "Water beads" or "Water marbles" and come in lots of fun colors---they start out the size of a lentil and GROW! Great fun for play with kids or to fill bottles/vases with for flowers. You can also find them at Wallyworld and garden places.

    However don't step on them--slipperier than goose snot!

    How long do they last until they hit room temperature?

    It depends. I laid one out on the counter and it took over an hour. For use on sprains and such, it will definitely last for the 20 minutes that's recommended.

    Wow thanks so much for posting this I need some rather large cold packs for camping because I get tired of using ice

    How do you plan using them for camping? In the cooler? If by chance they break open, you'll have a real mess with the crystals. I would suggest freezing bottled water and using them in your cooler...that's what we do. They stay frozen a long time and don't make a mess.

    I have a electric cooler I planned on making a tray that fit in the bottom Bottles are not practice because it's a.vertical (see my camper ible)