Live in the northeastern part of Thailand, upcountry, some miles outside of a small town with ricefields around. My pool is 10 years old. Filled it with water from the nearby artificial lake and filtered it with the own housewaterfilter during first filling. Changed to groundwater some weeks ago. It is a bit salty, but very clean. Must have iron in it. Why do I know that? For about 2 1/2 weeks the water remained very clear without adding any kind of chemical substances. Suddenly turned green and greener. Thought it must be because of copper or iron. Wrong! Full of Algae ! Put chlorine in it. Next day I had coffee in the pool. Filtered the water about 36 hours and then the water was again crystal clear and is at present still very clean. But soonest algae will return for sure.
1.How can I eliminate the iron. Because coffee will return again soon for sure if I use chlorine.... I googled a lot but could not find an answer for my problem.
2. Is there a cheap non-chlorine algae killer known to the experts or any kind of a iron-off method? We do have here in this country professional poolspecialists but all of them want to sell incredibly expensive stuff.
Thanks a lot for your hints and tipps.
(btw..I still wait for the professional water analysis which I will receive soonest I hope)