One fill systems
The most successful system on the market today is BSF (Battery Fill System). This system has a float valve with a showing white dot. When the cell needs water the dot drops as your 'indicator'. We have had the most success with the gravity
2 1/2 gallon container. Some of the older systems (black & yellow) had no indicators of when the batteries were filled & some used hand pumps that caused leaks. We also prefer the custom installation on the BFS by running the tubing in a serpentine pattern instead of a 'straight cell', too cell generic pattern. This method allows for expansion without leaking.
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