DIY EMT Solar pool heater

I would have a concern over the length added to the pump feed lines. The pump on my pool is high volume and low pressure. If the added lines are smaller that the existing lines and considering all of the 90 degree turns being added, you may reduce flow considerably.
We use a solar blanket to warm our pool. It is very effective in raising the water temperature in the day time and not loosing warmth at night.