New member with an emergency! (I'm sure thats how most members start ) I'm taking care of my landlords pool because she is a single women who getting older now, I took her in-ground 20K gallon (sand filter, chlorinated, vinyl) pool water for analysis today at her regular pool store. I had $100 of supplies in my hand when they told me to not bother buying any chemicals right now because my water was over 25,000 in TDS. I think she meant 2,500 PPM but she refused to sell me the chemicals saying that I would be wasting money buying chemicals without draining at least 70% of the pool. This pool shop does not offer any pool draining services. And they lost over $100 in business telling me this, I can think of no reason how they could be profiting unless they really believed what they were telling me....I'm confused. It's an old vinyl liner (14 years old) and I'm not sure it can take the strain of losing so much water. They wouldn't even tell me what the other readings were because they said the TDS was so high it was all irrelevant anyhow....maybe she did really mean it was 25,000 PPM? or is that next to impossible? AFAIK the pool has never been drained in 14 years.