Last year a pool company did the pool, the cost was $1500, and the pool was often not that clear, you could see the bottom, but a little hazy. This year was TFP, the cost was $300, $250 for the kit (it's expensive up here in Canada) and $50- for chlorine, and the water is as clear as can be. Season is just about over, pool is now 21C (that's 70F for you Americans).... The 8 year old is about the only one to get in at that temperature.... Coldest I will go is 24C, the better half maybe 23C..... So 1/5th the cost, and clearer water. I'm sold.