I used to have a deltec, it was great. When i want to upgrade my deltec, the next bigger deltec could not fit my stand so I found a BM that fit my stand and do a little more load than my old deltec. BM is very much a replica of deltec and bubble king depend on the models, they use the same pump as well, just different size of cylinder to have more water or less at half a price.
5 months now using BM, i am very please with BM. I am sure you can't go wrong with Deltec.
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