There's a huge jump in reliability between the Easy Set, and the Ultra series. But you can get even the largest Ultra - which is larger than many in-grounds - for less than $2,000. Small round pools, similar in size to the Easy Sets can be had for less than $600. From what we've seen, Easy Sets rarely make it more than one season, and often don't last the season without multiple patches on the doughnut.

What I'm trying to say is, if you leave your pool for 4 - 7 days, you're likely to come back to a pile of wet vinyl, in which case chlorine levels will be the least of your problems.

Still, if you want to try, a trichlor feeder is your best bet.

Ladders? As far as I know, a sturdy ladder for an Easy Set is a roll-you-own sort of affair.