pool didn't go up today....

[matt4x4]

Thus my reason why I tell people to use screenings (crusher run, or whatever else it's called) I have attached a site cross section explaining how i built mine. We have COLD HARSH WET winters here, and it has not moved at all.

The way I did it was,

1. I got the site relatively level, about 3" below final grade at most (on avg it was 2"). (dished towards middle)
2. Added screenings for a 3 foot wide ring so the pool wall sits centered on it.
3. Unsed plate compactor and water to compact - leveling the ring the whole time - very easy to do with this material.
4. Moved sand inside ring.
5. Set up bottom track and wall
6. Taped on vapor barrier 1 foot up on wall and let cover onto screenings about 1 foot into pool. (not shown)
7. Built cove from sand
8. Spread sand out evenly keeping dish of 8" deeper in center
9. installed liner (not shown)
10. Had fill brought in and backfilled around perimeter, keeping slope from pool to surrounding grade, compacted this and seeded grass. This extra fill was done over most of the slope of the screenings (gray in pic) to also make sure they can not wash out during heavy storms - (backfill around pool not shown on pic)

The reasons i did it this way were,

1. I didn't want to kill myself - I have nothing but solid clay where I live.
2. Screenings (stone dust no bigger than 3/16th) will pack to almost concrete like consistency and pretty much stay that way.
3. It gives a MUCH better/precise surface to work with/on, much easier to adjust, real easy to set patio blocks into and level (which I ended up not doing)
4. allowed for a better slope away from the pool.

I can also tell you that this proceedure will endure just about anything nature will throw at it, I've watched as my pool filled with 4 inches of water in less that an hour without so much of a piece of screening moving, my skimmer ran over for about 3 days as of late - the area under it is not affected other than being wet, the screenings there are still compacted rock hard.
It's endured winters with 4+ feet of snow - which turns into a lot of melt water.
I've had the pool surrounded with a lake of water due to my creek located 40 feet from the pool breaking it's banks severly and flooding the flat lawn the pool sits on with 6-10 inches of water - this condition will stay like that for a week in spring, 2 days if it's a freak summer storm.

Anyways, that's about it, as far as I'm concerned, this way is bulletproof, and for the minimal amount the screenings cost, it's such a time/back saver and you end up with a more precise level surface.