Roots Organics Formula 707 -- 3 Cu. Ft. Bulbs (MH The 3mm dome is heavy-duty

The 3mm dome is heavy-duty and clear

promoting rapid root development while minimizing stress

The 25-pack scales a room or restocks worn heads in one go

Two stainless pins for EC and TDS: Amperometric conductivity measured in the same body as the pH bulb

It performs at 7

Roots Organics Formula 707 -- 3 Cu. Ft. Bulbs (MH The 3mm dome is heavy-dutyFormula 707 is a ready to use soil created for fast growing, heavy feeding plants. It was designed with greater water holding capacity, less perlite and pumice, and a light charge of nutrients for a good back bone but plenty of room for you to amend. Its base is peat moss, coco fiber, compost, perlite and pumice. The bag is a 30 gal. grow bag with just less than 20 gals. of the finest quality potting mix. Just poke holes in the bottom, cut off the top