We had a pool built last summer. The builder did a lot of weird things one of which is using two pumps with one before the sand filter and the other after. The pool has a spa and the intention was that when the valve is set for the spa, the 2nd pump can be turned on to increase the flow rate. That does happen but I also notice after I've run both pumps that there is sand in the spa. I also notice that the pressure is zero on the pressure guage at the filter.
Has anyone ever seen this configuration? Is it possible that pulling water from the filter instead of pushing water to the filter can cause the sand to get pulled out of the filter?
This config has always seemed like a bad idea anyway. I'm thinking about re-plumbing so that the two pumps are in parallel feeding the filter with backflow valves on each pump for when only one is running.
Thoughts?
Has anyone ever seen this configuration? Is it possible that pulling water from the filter instead of pushing water to the filter can cause the sand to get pulled out of the filter?
This config has always seemed like a bad idea anyway. I'm thinking about re-plumbing so that the two pumps are in parallel feeding the filter with backflow valves on each pump for when only one is running.
Thoughts?