I've got really high phosphates (1000+), so I taught myself to open up my Heyward filter, clean it out, and am now trying to treat with PhosFree.
I cleaned it out, closed it up, turned it on, added the recommended amount of DE (7 lbs), added the PhosFree (and the instructions say to use 1L then wait a week before repeating the process). Only then did I realize I didn't reassemble the filter correctly and I had some small leaks. So I ended up having to drain half the filter again, open it up, reseal it, and close it up.
Now my question is: how much DE do I re-add? The full 7 lbs? Half? (It sure looked like a lot of DE ran out the bottom after the second opening.) Is too much DE harmful? Should I err on the side of too much or too little?
Also, secondary question, I assume most of my PhosFree probably ran out too...so I need to re-apply that from scratch, huh?