Thanks mike. I had  previously <span></span>tried a nylo grit with no results. Straight hydrochloric acid seemed to loosen it some. Maybe I could try the strata after allowing hitting it with acid.<div><br></div><div>Jason<br>
<br>On Sunday, March 16, 2014, Mike Marsoun &lt;<a target="_top" href="mailto:nulifesc@bigpond.com">nulifesc@bigpond.com</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto"><div>Use a strata grit brush (80 grit) and if you need a smoother finish follow with a nylo grit (120). <br><br>Sent from my iPhone</div><div><br>On 17 Mar 2014, at 3:36 am, Jason Francis &lt;<a target="_top" href="javascript:_e(%7B%7D,&#39;cvml&#39;,&#39;jfrancis@marbleglow.com&#39;);" target="_blank">jfrancis@marbleglow.com</a>&gt; wrote:<br>
<br></div><blockquote type="cite"><div><div dir="ltr">Any quick input on this one would be greatly appreciated....<div><br></div><div><br></div><div>I have an old lobby slate floor, 1000SF, and successfully removed ugly epoxy coating. When dry, on only certain tiles(20%), there is heavy efflorescence that I have not come across. It is mineral buildup that is very hard.(it barely scratches with a screwdriver) Acid cleaners did not make much of a difference. Grinding the floor would be too much work because of its rough texture, and it would end up flat.</div>

<div><br></div><div>How can I get rid of the buildup? I am thinking of trying a stronger acid, like muratic acid. The only solution I can come up with is possibly antique brushes on a variable grinder? I have no idea how that would work. Shot Blasting with baking soda, but that would be a pain...</div>

<div><br></div><div>Thanks!</div><div><br></div><div>Jason<br clear="all"><div><br></div>-- <br><div dir="ltr"><p><span></span><span></span> <img src="https://s3.amazonaws.com/uploads.wisestamp.com/e0fa50f897bd7471d114afc6c74242da/1334114155.png" alt="" style="font-family:Verdana,Arial,Helvetica,sans-serif;font-size:13.3px"></p>

<p></p><div><div style="font-size:13.3px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><strong><br><span style="color:#999999">Marble Glow</span><br></strong><span style="color:#999999">Jason Francis</span><br>

<span style="color:#999999">Sales / Lead Stone Pro</span><br><a target="_top" href="http://www.marbleglow.com" target="_blank">www.marbleglow.com</a><br><span style="color:#999999">333 Norton Road</span><br><span style="color:#999999">Red Hook, NY 12571</span><br>

<span style="color:#999999"><span title="Call with Google Voice">718-514-7343</span> <i>NYC</i> </span></p><p style="margin:0"><font color="#0033bb"><u>845-208-8289</u> </font><span style="color:rgb(153,153,153)"><i>Upstate</i> </span><br>

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<p></p><div><div style="font-size:13.3px;font-family:Verdana,Arial,Helvetica,sans-serif"><div style="margin:0 0 8px 0"><p style="margin:0"><strong><br><span style="color:#999999">Marble Glow</span><br></strong><span style="color:#999999">Jason Francis</span><br>
<span style="color:#999999">Sales / Lead Stone Pro</span><br><a target="_top" href="http://www.marbleglow.com" target="_blank">www.marbleglow.com</a><br><span style="color:#999999">333 Norton Road</span><br><span style="color:#999999">Red Hook, NY 12571</span><br>
<span style="color:#999999"><span title="Call with Google Voice">718-514-7343</span> <i>NYC</i> </span></p><p style="margin:0"><font color="#0033bb"><u>845-208-8289</u> </font><span style="color:rgb(153,153,153)"><i>Upstate</i> </span><br>
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