You have a good understanding of your pool water....your friend does not. You will waste time and energy trying to convert the "non-believers"......it's not worth it....let him spend his money in a way he thinks worthwhile and enjoy your savings.The first thing I learned here is that if you spent a little time on preventive maintenance you will save a lot of time fixing problems. So I just want to make sure I don't have to watch out for the temperature.
While water temp has some affect on algae growth, your test results show you will have absolutely no problems....regardless of temperature.
PS - those are very nice test results....good work!
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