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Thread: Is nepheline syenite same as #20 Silica?

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    Join Date
    Jul 2014
    Cobden, Ontario canada

    Is nepheline syenite same as #20 Silica?

    I just purchased a new 2100 Krystal Clear sand filter pump (today) and it calls for 50 pounds of #20 sand. I went to one farm/pool supply store and they said they only stock #16 and that it might be hard to find #20. I called another pool supply store and they had it and said it was the only one they stocked so I picked up a bag. When I got home I notice that the bag only reads "nepheline syenite" and has no numbers on it at all to say what size it is (I need between .45 and .85) or that it's even for pools or that it is even sand. It only has a warning label about not inhaling the dust when you're pouring it. The woman at the pool store swears it's #20 sand and will work.

    Is this the same as the #20 sand that I am supposed to buy? I just don't want to get it into the filter and do any damage if its the wrong stuff.
    Intex Ultra Frame AG 16' x 48" (purchased June 2011)
    5623 gallons (90% = 5061 gallons)
    Intex Krystal Clear model 2100 GPH Sand Filter Pump (purchased July 28/14)
    June 2011 purchased Bestway Flowclear SWG model #58215

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    happyheathen's Avatar
    Join Date
    Aug 2012
    Sacramento CA

    Re: Is nepheline syenite same as #20 Silica?

    Run over to Wikipedia and look up "nepheline syenite".
    Then "sand composition"

    There may be no difference - both are finely crushed stone "nepheline syenite" is often feldspar; "sand", as used in the US, is most often silica (silicon dioxide).

    Both are very similar stone,, and if ground fine enough, I can't imagine a difference - both are quite inert, so even if you get a batch of pure feldspar, it probably isn't going to eat you filer or your water (or even your skin)
    1980's 15,000 Gal IG Plaster; 1 1/2 hp Hayward Northstar; Hayward Swimclear C3025 Cartridge Filter (325 sq ft, nom.); Pentair Legend; Polaris PB4-60; Equipment 40' from pool. p.s.: it's an aye-aye.

  3. Back To Top    #3

    Join Date
    Jun 2014
    Toronto, ON, Canada

    Re: Is nepheline syenite same as #20 Silica?

    This is what I use in my intex 2800 gph sand filter and have no problems
    12' Intex Metal Frame Pool, 1500 gallons, Intex 2800gph Sand filter/pump, AquaPro PRO1100 HP, K-2006 Test Kit

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