Question:
we just balanced our water and added pristine blue ( took water to local pool shop and they said all looked good). It rained last night and now water is green. Do we need to shock again even though we just did yesterday?
Answer:
Rain often carries with it a high load of organics for your swimming pool. First, test the water and see where your chlorine level is. If it is at or below 1 ppm, you would want to shock. If it is above 1 ppm, I would still consider shocking the pool, but you might want to use a non-chlorine shock so that you do not raise the chlorine level higher than necessary.