Oops I did it with 2 scoops of powder and 5ml. Are my results going to be very inaccurate? I used 2 level scoops.Yes, you can use the less accurate 5 cc sample size with one scoop of powder. One drop of 0871 = 1 ppm FC roughly.
I use 10 cc for my routine testing.
You can safely swim in a pool as long as the FC is above the minimum and at or below SLAM level based on your CYA. You must also be able to see the bottom of the pool in the deep end of the pool.One more thing... I'm worried about how long it is going to take to reduce the FC to swimmable level.
I added the DE and it increased pressure from 17 to 18. After an hour or so it was near 24, so I backwashed and added DE again, putting it back around 18. Now it is up to 23 again. Do I continue this same process? Thanks!Sand filters are the slowest to clear. If you add DE to your filter, make sure you watch the pressure very closely because it can climb quite rapidly.