Mark-up in pool business is incredible, I'm installing an above-ground Intex salt chlorinator on my pool in San Antonio right now, purchase cost: $255. I have a 1-HP pump, gradually reduced over the years from 4 HP for a lot of reasons, still have good flow but low enough to duplicate above-ground pool flow. At this price you could put two of these generators in tandem to increase capacity and handle higher flows with shorter run times, each will handle up to 15K gallon pool. I'm doing a proof-of-concept with one unit on my 17K gallon pool. Plumbing conversion for above-ground Intex connectors was a bit of a challenge but about to start operation today.