Hydro-Logic KDF/Catalytic Carbon Upgrade Filters grower's choice 720 Comes with plastic stopper to

Comes with plastic stopper to secure the string at the desired length

Here's the specifications for the Grower’s Choice Horti-Tech LED (ROI-E420):

Minerals also deposit onto the submerged portions of the electrodes rendering those areas ineffective

the Atlas 9 is a grower's dream

two metal clamps and manifold

Hydro-Logic KDF/Catalytic Carbon Upgrade Filters grower's choice 720 Comes with plastic stopper toKDF Catalytic Carbon Filters reduce iron, sulfur, chlorine, chloramines and heavy metals. Great for city or well water! Doubles standard green carbon filter. #741622 is 10 in x 2. 5 in. #741624 is 20 in x 2. 5 in. #741626 is 20 in x 4. 5 in.