Korallin - C4002 Calcium Reactor with Eheim Pump Korallin Sale! from 59600 /per Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Korallin C-4002—Rated for up to 1600gal. Reactor height: approx. 24.00"; Diameter: 6.30"; Ground: 7.50"; Filling amount: 10 kgs (22lbs); Eheim 1250 Pump.