Above ground, round, 18 foot vinyl pool. Hayward sand filter with multiport valve system and the pump....not entire sure. Hayward Matrix multi-speed turbo injection II is what is written on it but it's old and no labels.
Based on the surprises in this new house, there is a high probability that the pool system isn't entirely the way it should be! For example, the multi-valve label is on backwards,so every function is reversed.