According to some of the publications out there that were used for developing the chemical suitability table that we have Aluminum Oxide Ceramic, Polyethylene Membrane, Silicon Carbide, Borosilicate Glass are all suitable for sampling chloride. We don't have a lot of information on Bromide but it is probably similar to sampling for chloride. Silicon Carbide is probably the most likely of the materials to not react with bromide. Silicon Carbide and Polyethylene membrane samplers have a pore size of 2 microns and Aluminum Oxide samplers have a pore size of 1 micron.

If you are wanting to sample preferential flow at 1 hr intervals you will probably want to use a high flow ceramic designed for sampling leachate in order to allow you to pull enough sample for analysis. There are ceramic plates and suctions cups that are designed for sampling at a low suction. They do have a low air entry potential so they will be limited in the wetness range in which they will work in.