Get this ... I just received a Cease and Desist order from a manufacturer of a copper sulfate product, basically directing me to pull a page off my web site because I'm saying:
-copper sulfate is ineffective at eliminating atmospheric contaminants and organic waste in swimming pool water;
- algae is "good": it indicates something's wrong with the disinfection; it's not because pool water is crystal clear that it is automatically pathogen-free;
- the 0.6 ppm free chlorine these products suggest is not enough, especially in outdoor stabilized pools;
- use too much CuSO4 and you'll possibly get green hair and staining;
- if you really want to use an algicide, use a polyquat instead of a linear quat or copper sulfate;
- as for the claims these products "stabilize the pH", my research shows that, if you follow the dosing instructions, the TA of a 10,000 liter pool will increase by 1 ppm, indicating that the CuSO4 is *probably* mixed with sodium bicarb; mixing the product with vinegar produces heavy foaming and gas, and you're left with blue crystals only. I'm not stating these products are cut with sodium bicarb, I'm just describing my findings.
- CuSO4 is toxic for fish;
- Maintaining a pool is not expensive, neither copper, silver or any other metals shouldn't be in your pool water.
The vendor is saying my blog entry causes them much harm and predudice, they're evaluating the damages, I'm publishing false information, and they're ordering me to stop damaging their reputation "either directly or indirectly"!
I have 5 days to comply or ...face a lawsuit!