Our pool cracked last year - had a team of 6 in for 4 days to lay additional steel reinforcing, hand pack concrete, re-do piping and paving ( ring-beam ) and plaster ready for fibreglass.
Trust me when I say - this is HARD LABOUR !!!
The fibreglass was done in less than a day. If you're in the Durban area, I can tell you who we used - very professional - Hennie at Falcon Fibreglass - has an excellent name in our area.
If you are putting in a pool, consider doing this at the start :
When adding the piping and return inlet to the pool, add an additional inlet for the return from the solar heating (panel or coils).
When ours was done, I added the following :
From the pump outlet that goes back to the pool : added a T-piece and a ball valve ( for flow control ) to each side of the T.
One ball value is piped to your normal return inlet jet.
The other goes to the solar heating location. I don't have the solar coils on the roof yet, but the pipe from the pool pump is sitting there waiting for that day.
From the location of the solar coils, have a return pipe back to the pool, going to a second inlet jet.
Once you ( & I ) get round to adding the solar coils, use the ball valves to regulate the flow of return water so that some passes through the coils, and back to the second inlet jet. The remainder of the water travels to the first (standard) inlet jet.
My point is, that if you think you might want to add some heating at a later stage, add the piping and inlet jet now.
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