This is my 7th year for my fiberglass pool and I love it. I have learned to manage the stains - fiberglass pools do tend to stain easily. The trick is to keep the ph on the low side, and alkalinity on the low side. Add the chlorine slowly - cal hypo seems to bring out stains more easily - I stick to bleach, and pucks very sparingly. My pool still looks like new. Feel free to ask any questions you may have.