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we have some dosatron system here in Bangladesh, they are pretty expensive and the spare part issue was already mentionned. The main problem we found is sand, coming through the sieve into the pump and blocking it. Here a frequently maintenance and cleaning might be needed.
Furthermore we are using TEKNA dosing pumps. That comes with a solar panel, charge controler and battery. To trigger the pump you would need a flow meter with a triger cable that triggers chlorine solution injection every e.g. 100l.
Best regards, Andreas*