Its my understanding that the 75 gpd membranes have a 96-98 % rejection rate. But that the 100 gpd ones are typically at 90%. I am seeing 90% in my 100 gpd unit but will switch it to a 75 the next time I need to replace it.
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You say this can contaminate the probe if not cleaned right away. Will this ruin the probe?You cannot test saltwater with a TDS meter. The range of most hobbyist grade TDS meters is 999 TDS and some may have a high range which can measure up to 10,000 by tens so are not as accurate in the high range. Saltwater in your tank is easily going to exceed 30,000-35,000 which is way out of range and can contaminate the probe on a TDS meter if it is not cleaned with DI right away.