After the fiasco 3 weeks ago, I've noticed a bit of hair algae growing along with some red turf algae. Something I have not seen in a while. I'm sure part of that was due to the lack of herbivores for the last few weeks.
While I do run GFO, I decided to test my P04. I first tested with my 2 year old Elos test kit which was well (2 years) expired and it came up clear. I then pulled out my Hanna Checker. According to my Hanna checker, my PO4 came in at .30 which is pretty high. My regent expired 4 months ago so I'm not sure how accurate that was but I'm sure it's still fairly accurate and judging by what I see in the tank, I'm sure there is elevated levels of PO4. I decided to run a bit of Lanthanum Chloride into my system to bring it back down. It's possible that my levels elevated from all the water changes in the wake of the disaster or it's possible that my GFO just isn't keeping up with whats been leaching out of my rocks.
I used this process before (noted previously in this thread) with stellar results. 5ml of LaCl mixed with 1 liter of RODI water. I drip the mixture via an IV bag into a 10 micron filter sock at a rate of 1 drip per second. It's a very slow process that requires keeping an eye on the filter socks as the LaCl reacts with the tanks water and percipitates the PO4 which clogs the filter socks up fairly quickly. I have several 10 micron socks ready to go which I will swap in as the socks back up. As I said, it's a slow process that will reduce the PO4 levels gradually over the course of several hours but the end results are pretty impressive and if done right, very safe in my experience.
There are some who have been experimenting with LaCl reactors but I really don't like that idea as it requires a lot of monitoring and constant adjustment. I feel my solution is much safer and most importantly isn't dosing LaCl continuously unlike the reactor experimentation. LaCl can be dangerous and I did a lot of reading/research to come up with my ratio and dosing method. All percipitate is caught in the filter socks and the LaCl reacts and binds with the PO4 instantly when it hits the water. The key is doing it very slowly and in a heavily diluted ratio of LaCl to RODI water.
None the less, here is the setup. I will update with the results late today or tomorrow when I am done with the process. Depending on the results, I expect that I may need to do one more follow up dose in a couple days. Note to any of you considering this. Do your homework first. This stuff can be dangerous to your livestock if used improperly.
The tools:
IV Bag with 1 Liter of water and 5ml of LaCl set to one drip per second..
Into the 10 micron sock.. The sock should back up with PO4 percipitate in an hour or so.