1)rubber tube 2)Strong dissolved oxygen 3)Adopt ... value (diameter from 20 ~ 30UM), and in the water pipe smoke drift, rise in the extremely slow, dissolved ... has obvious effect, thus greatly improve the oxygen in water, electricity, improve liquidity increases the breeding density.Apply pressure ... scope: 1 ~ 5 depthThe hoses can be wrapped in steel plate, and the corresponding plastic tube with a tee, ...