Solar Swimming Pool Heaters

I would like to explain the solar swimming pool heater process step by step. The order in the chain is as follow:

Pool ---> Strainer - pump - filter - pressure relief valve - check valve - flow control valve - solar collectors (heat exchanger) - flow control valve - Conventional Pool Heater ---> Pool

Lets start in the pool shall we. First the pool water is pumped (sucked) through a strainer (or rough filter) removing debris and anything that could create damage in the solar system. Then the water is pumped through a fine filter. Then the water is ready for the collector or heat exchanger normally mounted on the roof of the house. After the suns rays have created a much warmer water it passes through the conventional pool heater.' After that it's back into the pool.