Tunze RO level controller. $160 shipped.
(this used in tandem with the tunze 3155 gives you complete level control for freshwater reservoir and then your sump)
https://www.bulkreefsupply.com/ro-w...dOG5PgHNWgNnvtN7KWrZhM7oma3QDA5xoCW5EQAvD_BwE
(this used in tandem with the tunze 3155 gives you complete level control for freshwater reservoir and then your sump)
https://www.bulkreefsupply.com/ro-w...dOG5PgHNWgNnvtN7KWrZhM7oma3QDA5xoCW5EQAvD_BwE