On the use of NSW...we have a guy in town here that has a 2000g tank, and for economical reasons, used to use NSW collected locally. his tank did not do well. I recall testing the water here a few years back, it was low in salinity, low in pH and both Ca and alk. I didn't test for PO4, but suspect with local run-off, that might have been high. Along with the risk of pollutants (oil, gas, etc), I'd personally not use NSW.
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Brad
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