Apera Instruments AI209 Value Series PH20 Waterproof pH Tester Kit: Unmatched ±0.1 pH Accuracy! Review

Replacing the motor helped eliminate a noticeable rattling noise that was mainly due to the original impeller shaft wearing out with the motor over the years. This replacement comes with a new stem and helps a lot. Having an old filter meant it still rattled a bit here and there, but rotating the motor unit (by turning the washer like a knob) to a position where it was quiet also helps to keep it quiet. as it supports the device slightly (actually slightly) at an angle. As with any old favorite

I ordered the first block in mid July after my original engine started making noise. When I received the unit it was scratched and looked like it had been used, returned and repackaged. I did not install the unit and requested a replacement which was processed quickly. After running the second unit for 2 weeks the motor started making a horrible squeak so I requested another replacement which again was processed quickly and shipped with a delivery time of 1 day. At the moment the third device…

Aqua Clear 70. Aqua Clear filters are good when they work. Beware of those with fine sand, make sure the motor is off when changing the water as the sand will get into the motor housing and impeller magnet. I've been through 2 of these in the last 6 months. The first time, the impeller itself made a very loud vibration noise, and it turned out that the sand damaged the rotating impeller magnet and generated friction noise. So I replaced the impeller but when I put the motor housing back on I…

Replacing the motor helped eliminate a noticeable rattling noise that was mainly due to the original impeller shaft which has worn down with the motor over the years. This replacement comes with a new stem and helps a lot. Having an old filter meant it still rattled a bit here and there, but turning the engine block (like turning a knob on the washer) to a position where it was quiet also helps make it quiet. as it supports the device slightly (actually slightly) at an angle. As with any old…

I ordered the first block in mid July after my own engine started making noise. When I received the unit it was scratched and looked like it had been used, returned and repackaged. I did not install the unit and requested a replacement which was processed quickly. After running the second unit for 2 weeks the motor started making a horrible squeak so I requested another replacement which again was processed quickly and shipped with a delivery time of 1 day. So far the third device is working…

Aqua Clear 70 Aqua Clear filters are great when they work. Beware of those with fine sand, make sure the motor is off when changing the water as the sand will get into the motor housing and impeller magnet. I've been through 2 of these in the last 6 months. The first time, the impeller itself made a very loud vibration noise, and it turned out that the sand damaged the rotating impeller magnet and caused friction noise. So I replaced the impeller but when I put the motor housing back on I…