I am not sure if the links are going to show up right but in yalls opinion what is the difference between all the different double air difusers? They range from $129 to $215 and they all look the same for the most part. They have a hollow base you fill with sand or gravel, pvc type tubing splitting the air to 2 membrane type diffusers. I am trying to buy one and keep confusing myself!!!

https://www.123ponds.com/epmd2.html?gclid=EAIaIQobChMI7u2Zgb-12gIVFdNkCh0p_AYyEAkYAiABEgLG8_D_BwE

http://www.aquaticponds.com/Matala-Dual-...CyABEgJKKfD_BwE

https://www.shopaquatic.com/products/hak...ECABEgK5LPD_BwE

https://www.bjpond.com/product/vertex-xl2sw-coactive-airstation-diffuser/

Last edited by DRG; 04/12/18 02:58 PM.