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I looked it up and it looks like masonry sand could be made with limestone and if that is the case it is not an inert substrate and will affect the ph of your water.
 

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you can use pool filter sand, it will run you like 50lb bag for $15 or Black Diamond Blasting Abrasive that will run you for almost same price, the pool filter sand u can get it from ace hardware store and the black diamond that one is a little hard to get.
 
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