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I just watched this... So I hope to never have to use Lanthenum Chloride. It just does not seem like something worth risking fish and/or coral over. I use natural methods like chaeto in a sump and rarely even have to use GFO. This seems a bit over the top for me. Any thoughts?
The first thing I would do is dilute the lanthanum chloride with RO/DI water. This would allow you to titrate very carefully how much phosphate is removed per hour. I would do offline experiments to observe phosphate removal rates and probably find an optimum concentration lanthunum chloride. This seems straightforward.
Dripping it into the skimmer is an interesting idea. In could work but I would need to do offline experiments to check on what factors influence removal efficiency before I attempted it. Dripping it into a filter sock seems safer.