Looking for some advice, have a Hayward 36 DE filter, grids are about 5 years old, after backwashing and hosing down grids the pressure rises in a couple hours to the 20-30 psi range, normal range is 10-15 psi, the gauge appears to be working properly as it drops to 0 when pump is turned off, it has never done this before, the flow from the jets is ok but not great, when I switch multi-valve to recirculate the flow from the jets is noticeably stronger, pool is clear no visible algae, any suggestions?
Pressure rises too fast
- Thread starter Al114
- Start date
What you describe is what algae will do to a DE filter in short order. I'd recommend you read
Pool Care Basics
How are you testing the water
Pool Care Basics
How are you testing the water
Using the same test strips as I always have and keeping the levels within the recommended ranges
I understand but here we don't trust the test strips as they're inaccurate. One of two test kits on the recommended list in the following link
Test Kits Compared
Also a good read
Pool Care Basics
FC/CYA Levels
Overnight Chlorine Loss Test
SLAM Process
PoolMath
You have some algae in the water eventhough you may not see it yet but the fact the filter pressure goes up rapidly is a sign of algae. I prefer and use the TF-100 kits as many others on the forum with highly trusted results.
Test Kits Compared
Also a good read
Pool Care Basics
FC/CYA Levels
Overnight Chlorine Loss Test
SLAM Process
PoolMath
You have some algae in the water eventhough you may not see it yet but the fact the filter pressure goes up rapidly is a sign of algae. I prefer and use the TF-100 kits as many others on the forum with highly trusted results.