I think it's perfectly OK to use stream water for a fill under certain situations and conditions. I have done it for years, including Spring 2005 when I had to top with 10,000 gal while chasing a leak. I have a small stream on my property and have never had a problem. I agree that the water should be tested if possible, right before a massive fill. I don't. However, no fertilizers as nobody upstream uses fertilizers and most of the stream is fed by ground water. Also depends on the flow. In the Spring mine flows a lot so anything undesirable is probably flushed. Next, for the massive fills like last Spring, I pumped the stream into the waste line with the sand filter set on backwash so the water came out of the skimmer, after going through the filter in the right direction. For small top offs I pump right into the skimmer with the pool pump running. Then...shock like crazy. Again, it all depends on specific situations.
Al
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