I would use Rowaphos or Phosban. I'm not familiar with Phos-X. The problem with the "regular" phosphate sponges is that it releases back into when it gets saturated. Not so with the Rowaphos or the Phosban. But it tends to be pricey. Although a package will likely last you a while..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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