15 000 gal for $139 INTEX SWG

That SWG will be fine. To do better than that you need to spend well over $400.

I recommend getting an Intex sand filter and pump combination. If your electric rates are high (above $0.20/kwh) it is worth looking into a two speed or small variable speed pump, which will cost more up front, but save a great deal in electrical costs. At lower electric rates, the Intex sand filter/pump combo is a better deal.
 
The intex 2650 sand filter has gotten great reviews.

The swg you posted the link too should work fine. Make sure when you use it to disconnect the wire to the copper bars (second wire from the right of the link you posted just above).

Avoid the all-in-ones that have the swg and sand filter combined...the pump and the swg never fail at the same time.

I have a similar intex swg on my permanent 21' agp and it works great (on it's third year of life, though I think I will need to replace it next year).
 
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