Quote Originally Posted by borntworide View Post
I ask because when vacuuming i see the brown just blowing back in ... This experience is from last year.. Just checking to make sure there is nothing wrong with filter.
There's something wrong with the filter. A properly sized sand filter (big enough) with a properly sized pump (small enough) *WILL* remove iron; I have done so many times! Unfortunately, AG pool filters are often over-sized, and the pumps are under-sized.

There are 3 things you can do:

1. Install a valve between the pump and the filter, and SLOW the flow through the filter.
2. Check the sand as mentioned earlier
3. Use polyquat; it helps stick the particles together.

2 - 4 quarts of polyquat per 10,000 gallons would be a good idea; it will keep indefinitely, and you should use some each time you add water. Use the Amazon links; that way you can be sure of getting undiluted (60%) polyquat, with no added 'ingredients' to cause problems. (Plus, it helps support the forum; we get a commission on referred purchases.)

Get *only* the 21 degree Baume / 31% acid -- that concentration is solely acid + water; other concentrations may have 'helpful' (NOT!) ingredients. Any place you can find that (Lowes, Ace, etc.) is fine.